What kind of mileage did you get with that engine?

When it was running that is. :)


I've found that my mileage with both my '00 7.3 and my '05 remarkably
consistent. Which is to say a lot less than some of the amazing claims I've
read from others (including you). Which isn't to say that their claims are
in anyway inaccurate or not to be believed, but rather that driving style,
as with most vehicles has very much to do with the final results. In my
case, I've had an incurable affliction with my right foot, that first
manifested itself as a teenager and is with me to this day at 51 years of
age. I prefer to leave stop lights smartly and quickly put distance between
myself and the rest of traffic, assuming I've earned a position at the front
of the grid. On the highway, typical cruising speed is 75-80, and I don't
waste any time getting there. No one ever quotes the drag coefficient of
these trucks, but it must something akin to an old Norge. Which reminds me
that the air conditioning is on nearly year-round in my parts.

Given this, running empty at 7200 pounds a bad tank would yield mid 14's
(rare) and a good one would yield about 17 mpg (also rare). 15-16 is the
norm. Like I said, pretty much the same results with both trucks. I
absolutely believe the quality of the fuel varies from tank to tank and is
responsible for most of the fluctuation in mileage between tanks. With the
7.3 towing a 14k pound boat and trailer 65-70 mph I'd get about 8.5 mpg.
Haven't really towed the boat with the 6.0 yet. Sounds really crummy till
you realize that it's a 50% improvement over the 7.4 liter Suburban I
previously owned running empty or only towing a 10k pound boat and trailer.
No complaints from me.