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As mine rarely sees dirt/mud, I changed to 85 series tires that were a tad narrower and had a "commercial" tread. They look a lot like trailer tires from an 18 wheeler. Picked up about 1 mpg from them, run at max psi of course. For you Metro drivers that's a lot going from 14 to 15 mpg ~ 5%
Run your diesel in o/d slow as suggested, just make sure you don't let the rpms get to low or the engine will lug and the turbo will spool down. Your AT may shift out to prevent this, I cant say as mines a MT.
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