My car should be run on 98+ RON petrol but being a cheap skate I occasionally stuck 95 RON in for work trips. I recently went on a 380 mile motorway trip and noticed I received better MPG on the higher quality fuel. So maybe running 95 was a false economy?
After a few calcuations it seems that at todays prices (in green) I’m making a 1p per mile saving ny using the higher RON petrol. When the figures are played with a bit its evident that as long as I always see the same MPG gap there will need to be a 12p per litre difference between 95 and 98 RON before its economical to use cheap fuel. I was always happy to pay a little more for the better performance but it turns out I was getting it for free all along. Bargain!
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