On Saturday I went for a good long highway run. 40 miles out, then a couple of hours later, 64 miles back. The weather was fine and dry, no appreciable wind, kept my speed in hand, drove to the best of my hypermiling ability, and recorded 55.6 mpg UK.
This morning, in the dark and pouring rain, I made a 3.8 mile town drive (roads fairly quiet) where the coolant temperature never got up to operating temperature.
Then 4 hours later I did the same trip, this time in busy traffic and the highest the coolant temperature reached was 76°C. Average was 50.3 mpg UK for both trips.
(both figures from ScanGauge)
Surely the highway miles per gallon should be much better than the town driving, or the town driving much worse! A 10% improvement seems very poor. Is it me? Is the car not ideal for highway driving? Any suggestions would be most appreciated.
