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Howdy gang:

I towed with my 2012 RTL for the first time this past week. I took the truck empty up to Chicago and towed a 2500-pound boat and trailer home to Florida.

Truck ran great both directions, but now that I'm not towing a trailer, the truck is (still) consuming a lot of gas. The instant economy meter is saying around 18-20 instant highway MPG, but the range on a full tank is only around 280 miles, and the fuel is being used much faster. I usually get 350-400 miles per tank. Did the computer "learn" a different mixture for the trailer combo?

I've changed nothing else on the truck since the trip except not towing.

Should I reset my ECU?

Thanks!
 

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You may want to figure the mileage the old fashioned way. Fill tank and reset mileage on odometer. Run it to a quarter tank or so, fill again and divided miles on OD reset with the gallons on 2nd fillup.
 

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Yep. Only manual calcs from the trip meter & gas pump are reliable.
The 'range' on the dash is indeed a short-term 'learned' figure, so that's no good, either.
 
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