I've had this van for 9 years now. Bought it in '01 in very nice condition, (dealership serviced regularly) with 75, 000 miles on it. It now is still in very nice condition, (garage kept) has 135,000 miles. About 4 years ago I had a local shop, (I live in Florida) do some A/C work, (new compressor and hp line). The mechanic told me, (I know the guy) he also replaced the fan clutch with a heavier duty clutch and I don't remember if he told me this or it's just my suspicion, (temp indicator doesn't move much off of 100 degrees. Could be the gage?) that he also removed the thermostat. Ever since then, the van went from about 14 mpg to 10 mpg local and highway, A/C on or off. Now needless to say, with gas prices what they are, we don't drive this van around very much anyway, unless we need to, but I like it, I own it and I like to drive it. I've recently decided to try and get to the bottom of this poor MPG issue. I read on this forum a comment from one of the guys that, (and I'm paraphrasing here) "if things get worse after you've replaced a component, go back to that component". Makes sense! I've researched this forum and others to try and find out whether it would be better to go back to an OEM fan clutch, (the one my mechanic installed was a Hayden Severe Duty Clutch) or if I should consider going with electric fans. I can't say I've come away from any forum with a definite conclusion. I called Hayden Tech Support and asked for their advice. Pretty much the same. Flex-a-lite hasn't returned my call yet. My feeling is to replace the Hayden Severe Duty Clutch with their OEM version, (being the cheaper thing to do) reinstall, if it's missing the thermostat, (thinking that could be messing with the ECM?) and see what happens to the MPG then. If I still have an issue, I'll then have to look else where. Any comments or suggestions with regards to this issue and electric fans, would be very appreciated. I want to squeeze as may MPG out of this thing as I can. I'm already running Amsoil in the engine and the differential.