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As seen by my signature, my combination is pulling about 14700 lbs. also. I average 7.5 mpg on trips in flat highway pulling (I-95 to Florida) or pulling in hills in New York and Connecticut. I'm sure that western mountains will decrease the mpg's next summer but i am very pleased with my 8.1 and 4.10. My 3000-4000 miles per year does not warrant a diesel for my needs. I would NOT drop to a 6.0 regardless of the HP rating. This HP comes at a high rpms-one that you normally do not reach. You do need to keep the rpm's up to produce some power. I get better mileage at 63-65 mph than 50-55 mph. Good luck.
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