Finally got to take a road trip after installing my propane injection! I made a trip From San Antonio, Texas to Ruidoso, NM and wanted to post my findings. Got 14.75 mpg on the way there without propane, and 18.25 mpg on the way back with propane. Both ways were @ 75 mph with the cruise control set. Also used 6 gallons of propane on the way back, so total fuel mileage was actually 15.75 mpg. So I not a huge increase in overall mileage, but a MONSTEROUS increase in power! The truck never slowed or downshifted even on the big hills, and EGT's ran about the same. I'm still in the tweaking phase, so hopefully it will get even better, and I should be able to get to the Dyno soon. I will post more findings in the future, but so far this has been the largest power gain I've done, hands down...