The worth of diesel fell by virtually 12p final month - a file drop, in keeping with new figures.
The RAC stated the common worth per litre was now 147p, down from 158.9p firstly of May - making it the seventh consecutive month costs have fallen.
It means the price of a typical 55-litre tank is round £6.50 cheaper.
However, the RAC stated the autumn needs to be better to totally mirror adjustments within the wholesale market.
Petrol costs additionally fell by round 3p in May, from 146.5p to 143.3p.
The Competition and Markets Authority stated in May that rising costs in 2022 appeared to partially mirror "some weakening of competition".
RAC gas spokesman Simon Williams stated: "After calling for giant pump worth cuts for weeks, we have been happy to see that May was the month when this lastly occurred.
"The fact it appears to have been prompted by the Competition and Markets Authority's mid-month announcement about weakening competition in fuel retailing is surely not a coincidence.
"A 12p discount within the worth of diesel in a single month is one thing we have not seen in practically 23 years of monitoring costs.
"But despite this, it's still galling to see that a litre of diesel is 8.5p cheaper in Northern Ireland than it is in the rest of the UK.
"This factors to a extra clear and aggressive gas market there, one thing drivers in the remainder of the UK would very very like to see, significantly with cash being so tight within the cost-of-living disaster."
Read extra:Significant easing of inflation as vitality prices stabiliseChancellor snug with recession if it brings down inflation
Fuel costs started to extend firstly of 2022, partly pushed by pressures available on the market introduced by the warfare in Ukraine and sanctions on Russian corporations.
UK inflation has eased in latest weeks, helped by falling vitality costs, however meals costs stay excessive.
Content Source: information.sky.com
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