In my car I haven't reset the trip thingy in a couple of months and 1900 miles, it currently says 26.6 mpg.
That's mainly local driving and 1 or 2 longer motorway trips. On the motorway I see 35mpg+ on the screen. The system seems pretty accurate when I've done the maths, maybe exaggerates a wee bit
I see no harm in using one for commuting if you can afford it. My biggest problem would be with the parking side of it at the other end
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