[Roadhog]

Originally Posted by Fozzy

yeah, well, that'll teach me to post with no coffee and no bifocals.. ops:

:lol: :lol: :lol:

[Mr. Ford95]

squirrel, that is also true with passenger vehicles. I ran an average of 86mph on a run down I-81 from 300 miles(thank god no cops were out that day.) Turned around and ran 70 mph back, got better mileage at 86 in my pickup. The engine's tuning was for max mileage at a higher RPM. Did not know that until my dad showed me. My wife's Fusion is the same way. Got better mileage going to Greensboro averaging 68 than averaging 62 coming back.

[allan5oh]

Originally Posted by squirrelbait

I once read an interesting tale of finding the "SWEET" spot on the truck. Not every truck is going to get max fuel economy at 55, in this case the guy tried running 55 out to the west coast and then compared it to running 68 mph. The result was he got BETTER fuel mileage at 68 in HIS truck due to the way it was set up.

Another trucker myth. The slower you go, the less HP is "wasted" pushing air. Comparing 2 trips that may or may not be identical is not a very scientific way to do things. You have to take a much larger sample then that.

[heavyhaulerss]

well for one thing if your hauling flatbed as i do then loads that are lowest to trailer floor will get 1-2 more miles per gallon than a load that is 10 ft high. i get 7.5 8.6 mpg when hauling skid coils from indy in area to g.r. mi & back at 62 mph on cruise. doing the same run at top end i'll get 5.5-6 m.p.g. i also exccelerate slowly from a stop.

[marylandkw]

We had a great topic on this a few months ago, 3 pages long. It even has some good information in it.

http://www.classadrivers.com/phpBB2/...521&highlight=