We tow a 2619 with a GMC Jimmy with the same engine you're talking about. We average around 15 MPG while towing - our last trip was from Washington (State) to Virginia, South Carolina, back to the TM factory in Tennessee, and through Denver and over the mountains through th Eisenhower tunnel. 9515 miles in all - the worst place was Lookout Pass on the Idaho Montana border and we topped that at around 40. Do you have the "Tow-Haul" button on your truck? We always use that when we tow because it keeps your transmission from overheating. If you don't mind a few 40 mph pulls, you should be fine with the Silverado. We almost always tow with the cruise control set at about 65 and rarely have to turn it off. Do you have an automatic - the tow capabilities on the automatic are higher than on the stick shift. Good luck!
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