you checked air filter, fuel filter, all that good stuff? How fast do you drive to get 12 (or does it even matter)? I have a pro-stroker 22re that gets 19.5 @ 65-70 (that is with 4" of lift, 35X13.5 tires, dual cases, ARB bumber, rock sliders, camper shell when it is on, and 5.29 gears...just accounting for extra weight)...is the 12 just off-road or on the highway? Anything else going wrong? I mean do you have the same power that you used too (taking into account you have had the truck for a while)? List all and any symptoms that it might have and maybe we could help you a little more. IF you have an extra set of tires (smaller than 33), try and put em' on and then figure your mileage. Also, I know it is kinda elementary, but are you accounting for a larger size tire compared to what came stock on the truck? Even if your odometer says you have gone 100 miles, you may have actually gone more with a 33. I know on my tow rig it changed (It came with 265's and I put 285's and at 66-67mph I am actually going 70-71). So actually, if my trip says 100, I know I have gone more, but I just try and take an average with what type of driving I have been doing. Just my
IMHO you have something wrong. There is a runner on the forum with everything I have and 35's (and 3.0), and he says he usually gets around 15+mpg on the highway
http://board.marlincrawler.com/index.php?topic=35120.0 ...I would think you should get the same or better (although he does have 5.29's). Just tryin' to help.
