More data:
Back from the top-secret rendezvous in NM with my friends from the chat room...
We covered 2500+ miles round-trip, including a marathon 18 hr/1000 mile blast home last night.
We covered terrain from sea level to 10,000 ft., covered lots of highway miles, hundreds of miles of high speed washboard roads, and many many miles of low-range shelf roads and technical terrain.
The motor never skipped a beat.
For the second long trip, though, my external inline fuel pump started whining after periods of extended use. I carry a spare pump & filter, and it never even hiccuped, but it is annoying. I’ll probably switch to an in-tank setup eventually (not in a hurry though).
I’m frequently asked about the fuel mileage, which is not something I normally track, since I’m usually more concerned with getting there as fast as possible.
Coming down from 9000’ to 5000’, mpg = infinite. I think the tank actually got fuller
Calculated from the scanguage, calibrated for actual speed:
Texas Highway travel, where we had stretches at 75-80, and then slowed down for small towns, with an average speed of 65, I got 15 mpg.
Interstate travel, with an average speed of 75, I got 13.7 mpg.
Offroad, where I can’t calculate mileage since the scanguage doesn’t recognize low range (thinks it’s traveling at hwy speeds), I typically use a few gallons less than the 80s & 100s per fillup, which
is significant.
City driving mpg sucks. It’s not too much better than stock for me. I don’t even bother tracking it anymore.
I think the biggest issue with these trucks is the wind resistance. If you drove backroads & highways, and kept it under 55, you would probably approach 18-20 mpg. Any increase in speed comes at a price.