Anybody know what kind of gas mileage I can expect if I tow a jeep behind my truck? We take I-10 most of the way and I'll prob cruise at about 65-70mph. I hope to get at least 14mpg, does that sound about right? Or... is it even worth the trouble?
On mileage, there isn't any rule of thumb. It's going to depend on your vehicle and how you drive it. Whanging along at 70 mph is going to cost you, not to mention change your handling, response and braking conditions. When you tow, slow down...for economy and safety.
A relative once had a travel trailer that broke an axle right at the wheel mount, due to age/fatigue. It had been zooming along the interstate at 70 mph. When the axle broke, it sucked the full size pickup into the median, spun it around and slammed it into the opposite lanes against the outside guard rail, facing the opposite direction of travel. No one was hurt, the pickup was surprisingly only moderately damaged...mostly cosmetic. However, the trailer was totally destroyed and it was only through the greatest of fortune that no oncoming traffic was in the way. Why the whole rig did not overturn is anybody's guess. It just must not have been their day for that to happen.
I went up to Denver to help them out, so I got a first hand look. I think about that accident every time I tow. They didn't drive so fast after that. Me neither.
When I towed a 2,000 pound pop-up trailer (no wind resistance) behind my POC Ford F250, I got 9 mpg, every time. I got maybe 13 mpg without towing. I saw 14 mpg ONCE the entire time I owned this POS.
When I towed a 6,000 travel trailer, sticking well up in the wind with my Toyota Tundra, I got 10 mpg. When I bought the travel trailer I was expecting to be well down in the single digits based on my experience with the POC Ford. The Tundra has ranged from 8-14 mpg while towing this trailer. Without a trailer it consistently gets 18-19 mpg and has gone as high as 23.
Same speeds and the mpgs are averages over lots of miles and wind/weather conditions.
How can they be so different? Probably has something to do with better engineering and drivetrain design. The POC Ford had a very slightly larger engine and the vehicle weighed a little, but not significantly more, but it was pulling a vastly lighter load. Go figure. The combination gross was certainly considerably higher with the Toyota than the POC Ford.