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Some s-series trucks/SUVs had a build in mileage gauge. I think what Roy was asking you was do you have the factory gauge also and if you do how accurate is it compared to the Scanguage.
For what it's worth I have an Oldsmobile Bravada that I have been trying to squeeze better mileage out of. It's basically the same as a Blazer or Jimmy but with AWD instead of 2wd or 4wd. I have done some little stuff and I have managed to get it from an average of around 14.5 up to over 19 but I am trying to keep the mods on the more mild side for now. Although I really hope to pull off the ultimate mod on this truck early next year, which would be to just go ahead and jack up the radiator cap and roll a more efficent car under it.
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-Kevin
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