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I have gotten 23mpg driving on straight highway miles in my 2003 Jeep Wrangler 6-cylinder automatic with the factory all-terrain tires.
But the Jeep was not built for nor well suited for the highway. So, I put a set of mud grips on the Jeep and use it for what it's best suited for and what I bought it for: off road excursions to productive hunting sites.
With the big mud grips, now my on-highway mileage is about 16 mpg. The off-road mileage varies too much to meaningfully cite, greatly depending on such factors as the low-range or high-range transfer gear I'm using, the number of wheels I'm powering with lockers (two or four), the terrain I'm traversing (level mud or 20-degree rock), the speed I'm going (from a slow shuffle to a moderate walk), etc and etc.
No, the Jeep is not a high MPG car, unless the MPG means Miles Per Grin, which does apply to those of us who don't think pavement is the only road fit for travel.
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