15 MPG sounds just about right to me too. You've got an auto truck, and you're not driving at reasonable (60-65 MPH) highway speeds.
My Y2K gets consistently between 15. 3 and 15. 8 MPG for my brand of mixed highway/rural driving. I take er out of O/D anytime I'm under 50 MPH, and I travel empty almost all of the time. On a real "highway" trip out of state, I can expect 18-19 MPG depending on how fast I drive.
It's tough to keep my foot off the accellerator, and I noticed my mileage goes down DRAMATICALLY if I keep the highway speeds OVER about 65-68 MPH. At 75 MPH, I bet I'm only getting 14, but at 65 I'm probably getting 19. Lots of drag on these big beasts.
Greg
My Y2K gets consistently between 15. 3 and 15. 8 MPG for my brand of mixed highway/rural driving. I take er out of O/D anytime I'm under 50 MPH, and I travel empty almost all of the time. On a real "highway" trip out of state, I can expect 18-19 MPG depending on how fast I drive.
It's tough to keep my foot off the accellerator, and I noticed my mileage goes down DRAMATICALLY if I keep the highway speeds OVER about 65-68 MPH. At 75 MPH, I bet I'm only getting 14, but at 65 I'm probably getting 19. Lots of drag on these big beasts.
Greg