I'll fill in gaps later once I wake up, just got back from our road trip.
In all types of weather, we left in freezing temps and snow, got back in 84 and sun.
All kinds of roads from highways at erm.. high speeds.. to mountain roads in 2nd gear ... gravel roads at 30mph and all in between.
We did 1740 miles, got average of 22.7mpg and averaged 42mph overall. (it was 25.4mpg and 72mph average until we got to the mountains).

not too bad imo.

although if anyone has a spare rh/pass side headlight sitting around a pheasant took a liking to ours at .. lots of mph and pushed the whole headlight unit through.