Big mud tread pattern tyres make a surprising difference to the amount of fuel eaten. A lot of people don't really need the extra capability that a true large mud tyre can offer - and if they do it's not for the entire time they are driving the car. Factoring in all things, it would pay to consider two sets of feet - one highway pattern with low rolling resistance and the other the muddies for when you want to play. Even in reduction of wear on the mud tyres (which can be eaten by chip seal road surfaces) and not including the increased fuel burn it would probably pay off.
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