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I haven't been filling up the tank lately so I've been going by the UltraGauge for my mileage. I did do a trip on the highway recently and mileage indicated for the trip was 42.7. In town driving has been consistent at 29 - 31 mpg. Based on the gallons used and the miles driven, these readings are almost spot-on. At this point I have not done any aero mods yet. I am adding 3 oz. of xylene to 10 gallons of gas to cancel the negative mpg effects of the ethanol in the gas. This increased the mileage in my Blazer and it also works in the Focus. Tire pressure has been increased 4 psi over the sticker. Recently I read a very interesting post on a Ford Focus forum regarding the spark plugs to use for economy or power. I have taken their advise for economy and have changed plugs accordingly. So far mileage has increased 1 mpg and I'm hoping to see more of an increase as time goes by. I've also adjusted the nut behind the wheel and that has also made a positive improvement in gas mileage. I'll start filling up the tank again to get more accurate mileage results although past experience has shown that the UltraGauge is only a tenth or two off of the true mileage. One of these days I'll try calibrating it to get it right on. In the spring I'll put on some aero mods and maybe get another boost in mpg.
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