I tow with my 50i running the Velos tune, with no adverse effects. My longest tow was about 3000 lbs of boat and trailer 500 miles through the mountains in PA on the way back to Ohio. Mileage dropped by about 1/3 (21 mpg unladen on the way out, 14 mpg on the way back towing), but there were no other adverse effects, and engine temp (I have the P3cars gauge) remained normal throughout the trip.
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