just drove to and from seattle and got only 13 mpg! i really don't think it should be that low. i've got the 6.2/465/410/35's. at 60 mph, i'm turning 2361 - which is kinda high, but not too bad. i still think i should be getting better. what can affect fuel economy? how much will it help fuel economy to get a k/n style filter? currently my intake is not routed anywhere - it just takes in air from the engine compartment. How much would it help to direct air ducting to the front of the truck at the grille? when i rebuilt my engine 6K ago, i installed the injection pump w/ out replacing the copper washers. could this hurt fuel economy? i run my tires at 22-23 psi, and i'm not too interested in increasing the tire pressure. i think the gear oil in the tranny is super old - if i change that will it help? i need to do it any way, i suppose. i also think my timing is slightly retarded - could this affect my fuel economy? i have plenty of power (infact, i'm real impressed by it) - so i'm sort of dismissing any real tuning problems, but maybe i shouldn't be. Just seems that if something were wrong enough with my tuning to affect fuel mileage that much, i should be feeling it as a lack of power. thanks for any ideas!