Quote: I'm sorry but I'm going to have call bs on this too.
I hypermile the crap out of my '01 360 4x4 1500 w/ 4.10's and the best I can get is 18 at 50 to 55mph. The converter is chopped out, it has a Flowmaster 40 and an electric fan.
Also I would have to see this 3/4 ton "spin the tires" (on dry pavement, I'm assuming) to believe it.
4.10s are killing you, running around with no load is making the engine fight vacuum to pull the piston down and friction is a lot higher. It is pretty funny to hear some put hyper-miling and 4.10 gears in the same sentence
I couldn't believe it would spin the tires either! but it does, with ease. The reason for the superchips was the death flash. I knew it would advance the timing. I will do the slotting of the crank sensor when my arm will allow. If I set the programmer on the 91 setting It won't ping with 87 in the tank with a bottle of octane booster. So my point is even with the programmer, the timing still isn't where it should be. My truck has always been serviced at the local dealership so we know it has the death flash.
