Posted by Steven f/AZ on March 10, 2008 at 08:26:04 from (216.67.213.217):
In Reply to: 55 miles per hour posted by dave guest on March 09, 2008 at 20:02:20:
For some vehicles, yes 55mph helps with mileage - especially bigger vehicles.
My 94 del Sol had a best of 53 mpg going from Flagstaff to Kingman, AZ on the interstate staying at 75mph. It is downhill most of the way, so that helped. I did this twice while I owned the car.
For the 20,000 miles I drove it, I averaged 43 mpg overall. The difference between me driving 55, 75, or even up to 95 mph was a matter of a couple mpg. I had it geared so it was only turning 2000 rpm at 70mph and 2800 at 95mph. 5th gear was useless under 70mph because of the low rpms and small (1.5L) engine. It was a fun car, but two seats just doesn't cut it when your family increases to 3 people. :(
My Accord seems to average around 27 or 28 no matter how we drive it. The Dodge Grand Caravan will get up to 23mpg driving around 60mph steady, but only 18mpg in town.
This 97 Dodge Ram with a 360 and auto managed to average 17 mpg driving home to ND through the mountains and averaging around 75 mph. It had 212,000 miles on it at the time...
I also had one of those Thunderbirds like was posted above... 4.6 overhead cam v-8 would average up to 28mpg on the highway, usually around 25mpg mixed driving. Had an older one with a v-6 that wouldn't do that good, small engine had to work harder in such a big car.
I personally feel the solution is for people to stop driving big pickups and SUV's as their commuter vehicles. There are too many 3/4 and 1 ton pickups on the road around here with NO passengers, NO cargo and NO trailer!
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