Van and company car drivers in Gloucestershire won't be surprised by today's RAC's verdict: if you're running on diesel, you're being ripped off.

Data crunched by the RAC's Fuel Watch team suggests diesel owners are still being stung for an extra 20p per litre.

RAC spokesman Simon Williams told Punchline: "Drivers are having to fork out a massive 20p per litre more for diesel than petrol despite there being little difference between the two fuels on the wholesale market.

"While our data shows petrol is generally being sold at a fair price at forecourts at the moment, drivers of the country's 12m diesel cars - as well as almost every white van driver - have every right to feel hard done by as they're paying a huge premium for the fuel which in no way reflects its lower wholesale cost.

"For nearly a month, the gap between wholesale petrol and diesel prices has been less than 10p a litre and in recent days it has reduced to just 3.5p, yet average diesel prices at the pumps remain stubbornly high having fallen by only 2p since the start of February. The fact membership-only retailer Costco has been able to cut the average price of a litre of diesel by a massive 4p this week shows what's possible, but we badly need other fuel retailers to treat drivers of diesel vehicles fairly."

Despite the disparity, things could be worse: the gap between the average prices of petrol and diesel has dropped to under 20p (19.99p) for the first time since October 10, 2022.

"If retailers now do the right thing this should reduce significantly, saving drivers who rely on diesel a lot of money every time they fill up."