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You also have to look at the rolling resistance of the tread pattern of your new tires versus the old ones. Are we talking about off road 4x4 tires? If so then you aren't likely to ever get decent fuel mileage out of them. if you are talking about a road tire then you might have a chance at finding a decent FE tire for your truck.
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No green technology will ever make a substantive environmental impact until it is economically viable for most people to use it. This must be from a reduction in net cost of the new technology, not an increase in the cost of the old technology through taxation
(Note: the car sees 100% city driving and is EPA rated at 37 mpg city)
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