You guys are making me feel good about my 11.2 MPG (9 to 9.5 towing my Titanium 25' 5er) but what I don't understand is: I put on a K&N air system = better mileage + 1, then a Gibson exhaust = better mileage +1.5 but sounds like a pregnant bumble bee on steroids, then a Banks performance chip = mileage tanked - 4. Why?? Ok, the truck does pull better, and I know HP costs gas (energy) but really. Now I can actually use cruise control pulling in all but the mountains, but - 4 mpg?
Any ideas?
johncmr