If we calculated our last Buick's fuel economy in Imperial gallons,
we would have gotten 31 mpg in highway driving.
If we calculate our Avalon the same way, we get 38.4 mpg.
I am sure GM makes some models that get better than this.
It is very hard to make meaningful calculations and comparisons
across model and equipment lines.
And, as I conceded the other day, not everyone is impressed with
economy. Pickup trucks are the desired vehicle here, and they will
probably stay that way until fuel goes up to the $4-5 per US gallon.