To be honest I rarely look at the mpg screen, no point in getting depressed!
In the time I've had mine from what I've seen my highest has been 36. Couple of long runs coming up next week so will be interested to see what it can do.
You're safer working it out per tank though rather than basing it on the OBC. My first tank averaged 29 and my second 30. I don't even work it out anymore, just enjoy it instead!
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