Originally Posted by
Lastwagen
My display is usually showing around 12.2. This is nearly all town driving and I don't know how accurate the truck's computer is. I'll wait till I've got a few thousand miles on it before I calculate it the old fashioned way. Starting with a topped-off tank, and then running through at least 5 tankfull's before dividing it out.
That's exactly how I use to figure out my milage too. I figure the computer is doing a better job. I'll get low to mid 12's too if I step on it in the streets. I only have 280 miles on this baby so far so I'll check again after it's broken in. I know the Cummins takes about 20,000 miles before showing better fuel economy, atleast according to Dependable Dodge dealership. Anybody know how long the 6.7L Ford takes?