"No" wrote in message
oups.com...
YM Will V - Correct - A lesabre will show little difference, as you
noted, between 65 and 70. A 4 cyl car will show more difference at
those speeds. The smaller engines will need to work harder to maintain,
hence use more gas.

This morning I tried 55 and go 30 mpg, or two better than the 28 at 60.
Nice, but I'm still going to drive at 70.Thee is not just the time factor,
but it is UNSAFE to be on the highway at 55.