Diesel Grinch said:Well at the last fuel up MPG was at 14.5 not great but better then my first tank full. I'm hoping that by April when summer fuel comes back it will go up. Gearing is 3:73. Tires are a little on the big side, 265 instead of 245. I think the injectores were replaced around 10 to 20 thousand miles ago. Need to check paper work. Explain boost?