OK, my 2000 f150 with the 5.4 4x4 is getting 10mpg. I know that's crazy low since I drive 80% Highway. Stock ride height, stock size tires, 265/70/17 running 35psi, I baby it a majority of the time. Don't have any cel codes, minus the 02 sensor.
Things wrong with my truck: exhaust leak at the passenger manifold, no cats. I know it should still be better than 10mpg.
Any tips on fixing the manifold? It's my only vehicle and I'd like to get it done in one day or less.