This past weekend I made a 644 mile "off road"
trip between Columbus, OH and Atlanta, GA. This was an unloaded run with the truck listed in my signature.
I was running pretty hard and I stayed above 80 mph 85% of the trip and for the first hour or so I was running 90 or so (I was in hurry to get home). Here’s how the numbers looked,
- EOT - 208-210
- ECT - 198-201
- TFT - 169-173
- EGT - 650-900 but for the most part stayed in the 750 range
- Boost - I could hit 47 lbs in a heartbeat when I first got on it but would quickly settle down to 35. Running along at 85mph boost would stay around 20-22 psi.
Now for the mileage.... The LOM said I was getting 18.6 but when hand calculated it came up to 12.4. Now before anyone goes nuts and says that's crappy mileage you need to consider I'm moving an 8400 lb dually with 4.10 gears through the mountains of KY and TN while maintaining 80 mph. The same trip stock going 70-72 mph last year got me a whooping 9.2 mpg.
I'm happy with the results considering how fast I was moving and what I'm moving it with and I know if I slow down I can easily pickup another 1-2 mpg. I can test this in two weeks when I make the same trip back north and this time I'll keep it at 72-75 mph and see how it likes it.
The truck ran like a rapped ape and was a blast to drive. My only complaint would be that on really rough roads it's hard to keep a steady speed because the pedal is so darn touchy. The guys in the north will have fun trying to keep this under control because it was a PITA while driving back roads west of Detroit, MI.
FWIW.... On the way north to MI and going through the same mountains towing 12,500 lbs at 75 mph with the 210 tune I got 10.6 mph. Last spring when the truck was completely stock I did a run at the same speed between Atlanta and Orlando which is pretty flat land I got me 8.1 mpg.
If anyone has any questions ask away.