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The slightly larger diameter tires are gonna throw the odometer off by about 3.5% so you need to add that correction in on top of the odometer mileage displayed and see what that gets you. Plus the slightly taller gearing might be keeping the turbo boost in a little longer than it did with the 50 series tires on there. Have you done the waste-gate arm adjustment to make sure the waste-gate is staying closed till about 8 psi? There's a how to on the IPD sight or if you made your email available I could send you the instructions. Not that that's gonna help your gas mileage but it will at least give you the best performance out of your turbo.
Mike
'95 850T
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