Why does Shell fuel give better mpg in my Subaru Forester?

For the last three or so years I have dieseled up my Subaru Forester at our local Jet station. Recently, I had to do it at a Waitrose where I filled up with Shell. My average mpg on Jet had been around 43, but by the time I had used half the tank of Shell it was nearly 46mpg. I went back to Jet and it fell again to 43, so, after a couple of tanks, I tried Shell again with a similar result. I think the car runs better on Shell too and the price is similar. Is this a surprising discovery?

Asked on 9 November 2013 by JS, Canewdon

Answered by Honest John

Not at all. And my Mazda 6 diesel gives 9 per cent better mpg on Shell V-Power Nitro Plus than it did on Shell Fuelsave.

Tags: fuel economy real mpg

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