Not saying there is a correct answer but the extra 4mpg is while towing which for me is about 0.5% of the time, when not towing (i.e. daily driving) I get 24 hwy and 20ish city
15k miles @ 16mpg @ $4.19 (current price in Louisville) = $3928
15k miles @ 24mpg @ $4.19 = $2618
So for a years worth of driving (assuming gas doesn't go up, and we all know it will) I will save $1310 in fuel.
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