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I'm new to this forum, so maybe I've missed it, but what year is your s10? And how is it that you're having such poor mileage? My current daily driver is an '89, with NO options. On a recent trip of over 200 miles, my s15 got 35 mpg with the tailgate up. My previous s10, also an '89, with the big 4.3 and every option, got 29 more than once. My own experience with this 2.5 liter 4 cylinder, 5-speed, 3.73:1-axle s15 is limited since I've only had it for 2 months now, but I can tell you from my previous one that in back-to-back testing, lowering the truck 2 inches was a solid 2 mpg, and so was dropping the tailgate. I got that one with a failing 3.08:1 axle in it, so I installed a 3.42:1 axle right away, along with 235/60R15 BFGoodrich Radial T/As on American Racing Equipment style 767 wheels in a 15x8" size. I also installed a cat-back exhaust before my first mileage check. My current s15 is on Chevy 15x7" wheels, with too-small 215/60R15 tires, and has not been lowered yet, and in fact has no mods yet. Both my trucks have had the factory airdam in place under the front bumper. I haven't yet thought to verify the size of the radiator, as I still have the one from the 4.3, and I'm not sure what fan I have, because I don't care. I have a good electric fan from my '91 Camaro that got T-boned while parked, and I will be installing that. Once I get this s15 lowered and put a 3.42:1 axle in it, I expect 39 mpg. Could be snow on the ground before I get that far, though. My Fiero is my priority.
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