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It would probably be cheaper to just get bigger tires, wouldn't it? Well if you never plan on going off roading, you probably would be more efficient with smaller tires and a higher gear ratio.
Is it a turbo diesel? My dad has a huge truck with a turbo diesel. When I'm driving it in the summer it averages about 24 mpg surprisingly. I'm sure you've considered this before but I think having that could really help push you over 30 mpg.
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