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what kind of milage are you getting with your renegades or others with this engine.\?my is a 32 ft tandem & 40 ft stacker 55000 lbs gross 4.5 mpg. i havr a issue with the fan coming on at 75 mph on warm days for about 20 seconds at about 210 degrees temp drops to 190 within 15 seconds. two dealers have give up & said this is normal,it did not do thid when new. i have replaqced the thermosats twice one water pump & one radiator for nothing. thanks for any info mark young 919 427 2747