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Tires, not just inflation, make a huge difference in trucks. My 1-ton van mileage dropped by 3 when I switched from highway tires to M&S.
Those tires look new so I'm sure you don't want to toss them, but maybe you can get a set of summer highway tires to use nine months out of the year and use the current ones only as winter tires.
With a vehicle as heavy as yours, momentum is very important. The "never use your brakes" rule will do wonders for you I think.
If you tow, how are you going to do without that side mirror? That may have been a step too far. It looks like your mirrors will fold back - I might have started there rather than removing it altogether.
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