A motoring expert has claimed E10 fuel could cause "worse problems" for motorists.
E10 replaced E5 as the standard petrol sold in the UK in September.
The main difference between the two fuels is that E10 contains up to 10% ethanol - which is double the amount found in E5.
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The government say this will reduce the amount of vehicle emissions produced and have a positive impact on the environment.
However, motoring YouTube Channel Number 27 has said the new petrol may cause an increase in "fuel consumption" - as The Express reports.
The channel's founder says this is because ethanol is "less energy dense" meaning drivers will have to “use more” to cover a similar distance.
Jack said: "E10 actually causes an increase in fuel consumption for any car that's using it. Ethanol is actually less energy-dense than Unleaded fuel.
“So that means that because it has this lower energy density you have to use more and therefore your fuel consumption in your car will go up."
The Department for Transport's (DfT) Introducing E10 petrol study confirmed drivers would experience lower fuel economy under the new E10 grade, but said this will vary based on a motorist's driving habits.
The revelation came after concerns were raised by a quarter of private individuals in relation to fuel economy in the consultation.
Drivers questioned about the changes warned this could “mitigate emissions benefits” and could have a “ cost impact ”.
The DfT said: “We have considered the impact on fuel economy and decreasing MPG, which is due to the lower energy density of ethanol compared with fossil petrol, when developing our proposals.
“Analysis based on average calorific values of the two products suggests fuel economy could reduce by between one and two percent.
“However, the impact will vary based on driving style and refinements in fuel blending by suppliers.”
According to the RAC, the US Energy Information Administration (EIA) claims the energy content of ethanol is around 33 percent lower than Unleaded.
This means vehicle fuel economy may reduce by around three percent when using the new fuel.
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