Studies have shown hybrid cars, which run on plug-in electric batteries and a combustion engine, could produce three times more carbon dioxide than thought and use up to three times more fuel.
Studies by the UK's Emissions Analytics and a 2018 academic study in Norway, among others, have shown that tests performed on the plug-in hybrid vehicles failed to take into account driving habits.
They found drivers were far more likely to neglect to charge their cars than was accounted for in laboratory testing.
This, combined with the fact that the cars have a range of up to only 40 kilometres when properly charged, meant drivers were often failing to use the battery at all.
In effect, many vehicles were emitting more gas and using more fuel than they would have with a normal combustion engine, because of the extra weight of a battery.
Nick Molden, chief executive and founder of Emissions Analytics, told The National the problem was not of companies misleading the public, but that they were legally required to carry out their tests in laboratory settings.
“With plug-in hybrids there is a particular cocktail of problems,” Mr Molden said.
“The official figures try to boil down the carbon dioxide and the miles per gallon to one number for a plug-in hybrid.
"The problem with that is the answer depends so much on whether you charge the vehicle up or not.
“What happens if the driver does not charge it up? Then you get a much higher fuel consumption and a much higher carbon dioxide."
The problems with hybrids boils down, in part, to personal driving habits. If drivers charge their cars regularly and drive short distances, they can run them with virtually no emissions.
A lack of infrastructure and charging points is also a problem.
The EU has floated the idea of installing a million public chargers by 2025 for electric and hybrid cars.
The UK government said last year it was providing an extra £2.5 million (Dh11.8m) to fund the installation of more than 1,000 charge points for electric vehicles on residential streets.
Cricket World Cup League 2
UAE results
Lost to Oman by eight runs
Beat Namibia by three wickets
Lost to Oman by 12 runs
Beat Namibia by 43 runs
UAE fixtures
Free admission. All fixtures broadcast live on icc.tv
Tuesday March 15, v PNG at Sharjah Cricket Stadium
Friday March 18, v Nepal at Dubai International Stadium
Saturday March 19, v PNG at Dubai International Stadium
Monday March 21, v Nepal at Dubai International Stadium
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More coverage from the Future Forum
Funk Wav Bounces Vol.1
Calvin Harris
Columbia
STAGE 4 RESULTS
1 Sam Bennett (IRL) Deceuninck-QuickStep - 4:51:51
2 David Dekker (NED) Team Jumbo-Visma
3 Caleb Ewan (AUS) Lotto Soudal
4 Elia Viviani (ITA) Cofidis
5 Matteo Moschetti (ITA) Trek-Segafredo
General Classification
1 Tadej Pogacar (SLO) UAE Team Emirates - 12:50:21
2 Adam Yates (GBR) Teamn Ineos Grenadiers - 0:00:43
3 Joao Almeida (POR) Deceuninck-QuickStep - 0:01:03
4 Chris Harper (AUS) Jumbo-Visma - 0:01:43
5 Neilson Powless (USA) EF Education-Nippo - 0:01:45
If you go
The flights
Emirates and Etihad fly direct to Nairobi, with fares starting from Dh1,695. The resort can be reached from Nairobi via a 35-minute flight from Wilson Airport or Jomo Kenyatta International Airport, or by road, which takes at least three hours.
The rooms
Rooms at Fairmont Mount Kenya range from Dh1,870 per night for a deluxe room to Dh11,000 per night for the William Holden Cottage.
Ballon d’Or shortlists
Men
Sadio Mane (Senegal/Liverpool), Sergio Aguero (Aregentina/Manchester City), Frenkie de Jong (Netherlans/Barcelona), Hugo Lloris (France/Tottenham), Dusan Tadic (Serbia/Ajax), Kylian Mbappe (France/PSG), Trent Alexander-Arnold (England/Liverpool), Donny van de Beek (Netherlands/Ajax), Pierre-Emerick Aubameyang (Gabon/Arsenal), Marc-Andre ter Stegen (Germany/Barcelona), Cristiano Ronaldo (Portugal/Juventus), Alisson (Brazil/Liverpool), Matthijs de Ligt (Netherlands/Juventus), Karim Benzema (France/Real Madrid), Georginio Wijnaldum (Netherlands/Liverpool), Virgil van Dijk (Netherlands/Liverpool), Bernardo Silva (Portugal/Manchester City), Son Heung-min (South Korea/Tottenham), Robert Lewandowski (Poland/Bayern Munich), Roberto Firmino (Brazil/Liverpool), Lionel Messi (Argentina/Barcelona), Riyad Mahrez (Algeria/Manchester City), Kevin De Bruyne (Belgium/Manchester City), Kalidou Koulibaly (Senegal/Napoli), Antoine Griezmann (France/Barcelona), Mohamed Salah (Egypt/Liverpool), Eden Hazard (BEL/Real Madrid), Marquinhos (Brazil/Paris-SG), Raheem Sterling (Eengland/Manchester City), Joao Félix(Portugal/Atletico Madrid)
Women
Sam Kerr (Austria/Chelsea), Ellen White (England/Manchester City), Nilla Fischer (Sweden/Linkopings), Amandine Henry (France/Lyon), Lucy Bronze(England/Lyon), Alex Morgan (USA/Orlando Pride), Vivianne Miedema (Netherlands/Arsenal), Dzsenifer Marozsan (Germany/Lyon), Pernille Harder (Denmark/Wolfsburg), Sarah Bouhaddi (France/Lyon), Megan Rapinoe (USA/Reign FC), Lieke Martens (Netherlands/Barcelona), Sari van Veenendal (Netherlands/Atletico Madrid), Wendie Renard (France/Lyon), Rose Lavelle(USA/Washington Spirit), Marta (Brazil/Orlando Pride), Ada Hegerberg (Norway/Lyon), Kosovare Asllani (Sweden/CD Tacon), Sofia Jakobsson (Sweden/CD Tacon), Tobin Heath (USA/Portland Thorns)
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