The 92mpg is a "return" trip in that it's my trip home.
I usually get lower mpg on the trip to work, but not by much at present; 90.5mpg (imp) this morning.
Differences between the two are a slight elevation, work is higher than home; lower air temperatures in the morning and maybe a colder engine. This time last year I was getting figures in the 70's on the same route - I think the biggest change is driving habits. Oh and a different brand of "green" tyre on the front - michelin now, was continental.
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