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Not buying into this supermarket fuel excuse, I've filled up at the same station for all my years of driving, I've occasionally used Shell and BP but the small increase in economy did not make up for the £4-7 more per tank it'd cost to fill.
So now I find myself asking the same question again as I seem to have even worse consumption than when I first posted this thread. I haven't had a computer update since I got the car in 2010 and for a year and a half after that I was getting magical results, 75mpg average over the tank for example (worked out with maths not the trip).
I'm even considering taking my car to a dealer just for a reflash to latest software to see if it helps but I know they'll charge me an hours labour and it might be worse.
Currently struggling to get over 55mpg over the tank. It's good, but not by my records.
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