I drive a V70 T5, with a 299 bhp BSR conversion. My general home-to-work-and-pottering-about mpg is 25-26 mpg. I habitually run on Sainsburys 97 RON petrol. I know, I know, but I live a couple of miles from a supermarket and it'd convenient and cheap.
I recently ran down to the south coast, and had an 800 mile round-trip. Journey down, I ran a tank of Tesco 99 RON. I occasionally use it, but I generally find it's not good at delivering good mpg.. Got 25.6mpg, travelling at 85-95 most of the way, cruising on motorway/A roads.
On the way back, filled up with Shell 95 RON, as there was nothing else available. Same conditions, route, driving style, speed etc. Got 27.5 mpg...?!?
Does anyone find that certain fuels are better than others? The Tesco 99RON seems to provide a very smooth run, but crappy mpg.. Sainsbury's 97 RON is the same, but better mpg. Total 97 RON is similar to Sainsbury's stuff.
I would be interested to hear anyone's thoughts and experiences. Conventional wisdom says it shouldn't make much difference, but a change in petrol seems to have an appreciable effect. The Tesco 99 RON lierally seems to be 2-3 mpg worse over a full tank..?
Only forecourts near to me are Sainsburys, tesco (with the 99 RON petrol), Total, and a Shell, which is a bit of a trek. There is also a Murco forecourt near to work...
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