I am very easy on it (running stock 245s too). Its a 32 mile RT commute, all city, but I leave at 5 am and usually don't come home until after 7 so its not like I am stop and go traffic. I just travel at posted speed limits and not too agressive.
If I blast away from every stop light though, it starts dropping.
Towing the trailer I have got anywhere from 6-10, average about 8mpg with 19 klb gross.
Best tank was 17 mpg, all highway in the winter in the mtns... cruise control at 65 mph, no a/c, roads were dry so 2wd.
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