Most drivers with a long commute are keen to keep fuel consumption down – but do many know the best way to do this?
Whether crawling between Dubai and Sharjah, or eating up the kilometres between Abu Dhabi and Dubai, there are ways to cut petrol costs, some of which go against what we might expect.
Few people have looked at the subject in greater detail than Prof Turlough Downes, of the School of Mathematics at Dublin City University.
In his day job, Prof Downes is an astrophysicist who studies how dust particles come together, over long periods of time, to form planets.
Air resistance is of central importance to this, and in the past few years Prof Downes has applied his knowledge to road vehicles, because aerodynamics is key in determining fuel consumption.
Finding the best speed
He has worked out what is roughly the “sweet spot” for cars on longer journeys in top gear.
“You will find most cars are designed so they’re travelling at their best between 80 to 90kph. For some cars it will be 80, for some, 90,” he says.
Above this speed, fuel use is heavily influenced by air resistance, because the increase in resistance is not proportional to speed, but to its square. This means that if a car accelerates from 80kph to 160kph, air resistance does not double, it quadruples.
When going from 80kph to 100kph, which is 25 per cent faster, wind resistance soars by about 50 per cent.
Prof Downes has calculated that, in part because of this, fuel consumption is about 28 per cent higher at 100kph than at 80kph.
“For some cars it might be 25 per cent, for some 35 per cent, but 28 per cent is the middle number,” he says. “It might differ from car to car [based on] what the size of the wing mirror is, what kind of tyres.”
Prof Downes tested his calculations on his previous car, a 2012 Seat Leon, and found that they tallied well with the real world.
Speed up further to 120kph, and fuel costs are 63 per cent higher than at 80kph, while at 140kph they are no less than 103 per cent higher. This means the car is burning more than twice as much fuel.
From Dubai to Abu Dhabi
What does this mean for UAE residents who have a long motorway commute, perhaps between Dubai and Abu Dhabi? Prof Downes has helpfully crunched the numbers for the UAE.
Based on a fuel price of Dh3.62 per litre, a journey length of 139km and a car of roughly average fuel consumption, he has calculated that at a constant speed of 80kph, the Dubai-Abu Dhabi journey takes 104.25 minutes and costs Dh30.19.
Press the accelerator to increase the speed to 100kph and the trip lasts 83.4 minutes but costs significantly more – Dh38.68.
Faster still, at 120kph, the journey time is 69.5 minutes and the cost is Dh49.06, or almost two-thirds higher than at 80kph.
Anyone driving at the top speed of 140kph would make the trip in 59.6 minutes, but their wallet or purse would be Dh61.33 lighter as a result. That’s more than double the cost at 80kph.
In his own driving, Prof Downes admits he is not a “hypermiler”, the name for people who try to squeeze every last mile out of a tank of fuel. He finds a reasonable compromise.
“I can only imagine what it’s like to travel at 80kph on a motorway,” he says. “But I do travel at 100kph, going at the same speed as lorries. I don’t feel I’m getting in people’s way too much.
“Time savings aren’t that great [from driving faster]. If you have a habit of going at 120kph the costs stack up month after month. I would rather spend the money on something else.”
Prof Downes now drives an electric car and he says similar figures apply when it comes to how costs increase with speed.
Other factors that force up fuel costs are driving in the wet and using a roof box. Prof Downes found out the effects of a roof box when he left one on his car for a trip across Ireland after returning from a holiday in France.
“I just didn’t have time to take off the roof box. I used about 50 per cent more fuel on that journey. I was just astonished, what it did. I thought it might increase it by 10 or 15 per cent, but it was more than that,” he says.
As well as creating drag itself, a roof box disrupts the aerodynamics of the car it is on, Prof Downes says, making its impact on air resistance greater.
“Keeping your tyres properly inflated is extremely important. If your tyres are a little bit softer, that will damage your fuel efficiency a lot,” he adds.
While, on longer journeys, weight tends not to have as dramatic an impact on fuel consumption as air resistance, it does have an effect, so Prof Downes advises drivers not to leave things in their car boot unless they are needed.
Keeping steady
In heavy traffic, such as when stuck in a logjam between Sharjah and Dubai, the important thing is to try to maintain a constant speed.
“You don’t gain anything by going faster, because you will always be stuck behind the car in front of you,” Prof Downes says.
So if the car ahead rushes away as the traffic begins to move, the best strategy is to move forward slowly, as this way you may avoid having to use the brakes – and wasting the energy used in accelerating – as vehicles ahead grind to a halt again.
“Try to drive as if you’re not going to use your brakes,” he says. “Always try to anticipate when you’re going to slow down, so you keep your foot off the accelerator.
“Just cruise along as slowly as you can. If everybody goes as slowly as possible, you will get home faster … It’s very counterintuitive so it’s very difficult to get everybody to do it.”
Dubai police supercars: in pictures
Jetour T1 specs
Engine: 2-litre turbocharged
Power: 254hp
Torque: 390Nm
Price: From Dh126,000
Available: Now
COMPANY PROFILE
Name: Akeed
Based: Muscat
Launch year: 2018
Number of employees: 40
Sector: Online food delivery
Funding: Raised $3.2m since inception
Killing of Qassem Suleimani
UAE SQUAD
Khalid Essa (Al Ain), Ali Khaseif (Al Jazira), Adel Al Hosani (Sharjah), Mahmoud Khamis (Al Nasr), Yousef Jaber (Shabab Al Ahli Dubai), Khalifa Al Hammadi (Jazira), Salem Rashid (Jazira), Shaheen Abdelrahman (Sharjah), Faris Juma (Al Wahda), Mohammed Shaker (Al Ain), Mohammed Barghash (Wahda), Abdulaziz Haikal (Shabab Al Ahli), Ahmed Barman (Al Ain), Khamis Esmail (Wahda), Khaled Bawazir (Sharjah), Majed Surour (Sharjah), Abdullah Ramadan (Jazira), Mohammed Al Attas (Jazira), Fabio De Lima (Al Wasl), Bandar Al Ahbabi (Al Ain), Khalfan Mubarak (Jazira), Habib Fardan (Nasr), Khalil Ibrahim (Wahda), Ali Mabkhout (Jazira), Ali Saleh (Wasl), Caio (Al Ain), Sebastian Tagliabue (Nasr).
Black Panther
Dir: Ryan Coogler
Starring: Chadwick Boseman, Michael B Jordan, Lupita Nyong'o
Five stars
The specs
Engine: 6.2-litre V8
Transmission: ten-speed
Power: 420bhp
Torque: 624Nm
Price: Dh325,125
On sale: Now
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- Olympic-size swimming pool with a split bulkhead for multi-use configurations, including water polo and 50m/25m training lanes
- Premier League-standard football pitch
- 400m Olympic running track
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- 600-seat auditorium
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Our family matters legal consultant
Name: Hassan Mohsen Elhais
Position: legal consultant with Al Rowaad Advocates and Legal Consultants.
How much do leading UAE’s UK curriculum schools charge for Year 6?
- Nord Anglia International School (Dubai) – Dh85,032
- Kings School Al Barsha (Dubai) – Dh71,905
- Brighton College Abu Dhabi - Dh68,560
- Jumeirah English Speaking School (Dubai) – Dh59,728
- Gems Wellington International School – Dubai Branch – Dh58,488
- The British School Al Khubairat (Abu Dhabi) - Dh54,170
- Dubai English Speaking School – Dh51,269
*Annual tuition fees covering the 2024/2025 academic year
SHAITTAN
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Fixtures
Sunday, December 8, Sharjah Cricket Stadium – UAE v USA
Monday, December 9, Sharjah Cricket Stadium – USA v Scotland
Wednesday, December 11, Sharjah Cricket Stadium – UAE v Scotland
Thursday, December 12, ICC Academy, Dubai – UAE v USA
Saturday, December 14, ICC Academy, Dubai – USA v Scotland
Sunday, December 15, ICC Academy, Dubai – UAE v Scotland
Note: All matches start at 10am, admission is free
Profile of RentSher
Started: October 2015 in India, November 2016 in UAE
Founders: Harsh Dhand; Vaibhav and Purvashi Doshi
Based: Bangalore, India and Dubai, UAE
Sector: Online rental marketplace
Size: 40 employees
Investment: $2 million
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Abu Dhabi card
5pm: Handicap (TB) Dh100,000 2,400m
5.30pm: Wathba Stallions Cup Handicap (PA) Dh 70,000 2,200m
6pm: Abu Dhabi Fillies Classic Prestige (PA) Dh110,000 1,400m
6.30pm: Abu Dhabi Colts Classic Prestige (PA) Dh110,000 1,400m
7pm: Handicap (PA) Dh85,000 1,600m
7.30pm: Maiden (PA) Dh80,000 1,600m
The National selections:
5pm: Valcartier
5.30pm: AF Taraha
6pm: Dhafra
6.30pm: Maqam
7pm: AF Mekhbat
7.30pm: Ezz Al Rawasi
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Four motivational quotes from Alicia's Dubai talk
“The only thing we need is to know that we have faith. Faith and hope in our own dreams. The belief that, when we keep going we’re going to find our way. That’s all we got.”
“Sometimes we try so hard to keep things inside. We try so hard to pretend it’s not really bothering us. In some ways, that hurts us more. You don’t realise how dishonest you are with yourself sometimes, but I realised that if I spoke it, I could let it go.”
“One good thing is to know you’re not the only one going through it. You’re not the only one trying to find your way, trying to find yourself, trying to find amazing energy, trying to find a light. Show all of yourself. Show every nuance. All of your magic. All of your colours. Be true to that. You can be unafraid.”
“It’s time to stop holding back. It’s time to do it on your terms. It’s time to shine in the most unbelievable way. It’s time to let go of negativity and find your tribe, find those people that lift you up, because everybody else is just in your way.”
Everton 1 Stoke City 0
Everton (Rooney 45 1')
Man of the Match Phil Jagielka (Everton)
Europa League group stage draw
Group A: Villarreal, Maccabi Tel Aviv, Astana, Slavia Prague.
Group B: Dynamo Kiev, Young Boys, Partizan Belgrade, Skenderbeu.
Group C: Sporting Braga, Ludogorets, Hoffenheim, Istanbul Basaksehir.
Group D: AC Milan, Austria Vienna , Rijeka, AEK Athens.
Group E: Lyon, Everton, Atalanta, Apollon Limassol.
Group F: FC Copenhagen, Lokomotiv Moscow, Sheriff Tiraspol, FC Zlin.
Group G: Vitoria Plzen, Steaua Bucarest, Hapoel Beer-Sheva, FC Lugano.
Group H: Arsenal, BATE Borisov, Cologne, Red Star Belgrade.
Group I: Salzburg, Marseille, Vitoria Guimaraes, Konyaspor.
Group J: Athletic Bilbao, Hertha Berlin, Zorya Luhansk, Ostersund.
Group K: Lazio, Nice, Zulte Waregem, Vitesse Arnhem.
Group L: Zenit St Petersburg, Real Sociedad, Rosenborg, Vardar
Our House, Louise Candlish,
Simon & Schuster
PROFILE OF CURE.FIT
Started: July 2016
Founders: Mukesh Bansal and Ankit Nagori
Based: Bangalore, India
Sector: Health & wellness
Size: 500 employees
Investment: $250 million
Investors: Accel, Oaktree Capital (US); Chiratae Ventures, Epiq Capital, Innoven Capital, Kalaari Capital, Kotak Mahindra Bank, Piramal Group’s Anand Piramal, Pratithi Investment Trust, Ratan Tata (India); and Unilever Ventures (Unilever’s global venture capital arm)
All or Nothing
Amazon Prime
Four stars
Results
Stage 7:
1. Caleb Ewan (AUS) Lotto Soudal - 3:18:29
2. Sam Bennett (IRL) Deceuninck-QuickStep - same time
3. Phil Bauhaus (GER) Bahrain Victorious
4. Michael Morkov (DEN) Deceuninck-QuickStep
5. Cees Bol (NED) Team DSM
General Classification:
1. Tadej Pogacar (SLO) UAE Team Emirates - 24:00:28
2. Adam Yates (GBR) Ineos Grenadiers - 0:00:35
3. Joao Almeida (POR) Deceuninck-QuickStep - 0:01:02
4. Chris Harper (AUS) Jumbo-Visma - 0:01:42
5. Neilson Powless (USA) EF Education-Nippo - 0:01:45
MATCH INFO
Azerbaijan 0
Wales 2 (Moore 10', Wilson 34')
Global state-owned investor ranking by size
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China
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3.
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UAE
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4.
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Japan
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5
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Norway
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Canada
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Singapore
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Australia
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Saudi Arabia
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South Korea
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'Tell the Machine Goodnight' by Katie Williams
Penguin Randomhouse
The biog
DOB: 25/12/92
Marital status: Single
Education: Post-graduate diploma in UAE Diplomacy and External Affairs at the Emirates Diplomatic Academy in Abu Dhabi
Hobbies: I love fencing, I used to fence at the MK Fencing Academy but I want to start again. I also love reading and writing
Lifelong goal: My dream is to be a state minister
MIDWAY
Produced: Lionsgate Films, Shanghai Ryui Entertainment, Street Light Entertainment
Directed: Roland Emmerich
Cast: Ed Skrein, Woody Harrelson, Dennis Quaid, Aaron Eckhart, Luke Evans, Nick Jonas, Mandy Moore, Darren Criss
Rating: 3.5/5 stars
UAE currency: the story behind the money in your pockets
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Blonde
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The specs
- Engine: 3.9-litre twin-turbo V8
- Power: 640hp
- Torque: 760nm
- On sale: 2026
- Price: Not announced yet
RACE CARD
5pm: Wathba Stallions Cup – Handicap (PA) Dh70,000 (Turf) 2,200m
5.30pm: Khor Al Baghal – Conditions (PA) Dh80,000 (T) 1,600m
6pm: Khor Faridah – Handicap (PA) Dh80,000 (T) 1,600m
6.30pm: Abu Dhabi Fillies Classic – Prestige (PA) Dh110,000 (T) 1,400m
7pm: Abu Dhabi Colts Classic – Prestige (PA) Dh110,000 (T) 1,400m
7.30pm: Khor Laffam – Handicap (TB) Dh80,000 (T) 2,200m
From Europe to the Middle East, economic success brings wealth - and lifestyle diseases
A rise in obesity figures and the need for more public spending is a familiar trend in the developing world as western lifestyles are adopted.
One in five deaths around the world is now caused by bad diet, with obesity the fastest growing global risk. A high body mass index is also the top cause of metabolic diseases relating to death and disability in Kuwait, Qatar and Oman – and second on the list in Bahrain.
In Britain, heart disease, lung cancer and Alzheimer’s remain among the leading causes of death, and people there are spending more time suffering from health problems.
The UK is expected to spend $421.4 billion on healthcare by 2040, up from $239.3 billion in 2014.
And development assistance for health is talking about the financial aid given to governments to support social, environmental development of developing countries.
Film: Raid
Dir: Rajkumar Gupta
Starring: Ajay Devgn, Ileana D'cruz and Saurabh Shukla
Verdict: Three stars