Drove 10 hours straight and got 10.7 mpg...

[OrangeCrush]

Originally Posted by PhilD

It's most probably not dropping out of overdrive anyway, more often than not the TC just comes out of lock up, about a 300 rpm difference, and starts warming that tranny fluid up.

Phil,

Oh, I assure you it's dropping out of overdrive... damn thing drops 2 gears and the tach jumps to 3100 and stays there.

Normally as soon as I start an incline and it drops into passing gear, I'll turn the cruise control off and drive it myself.

On a minor incline, I purposely left the cruise control on and that stupid sob dropped into second, went up the entire hill, came over the top and stayed there for about another 1/4 mile.

It's simple, these trucks are not meant to have the cruise control on at 80-90 mph... or 70

Supercharger will take care of that.

Mark