Huge decrease in MPG!
I have noticed that in the past month or so, my truck is getting horrible fuel mileage then that it used to get. Here a few months ago, I was getting 14.3-14.5 around town. That is babying it big time. When I would treat it a little harder, I would get about 12.8-13.2 around town. Out on the highway, going around 70, it would get 17-18, depending on traffic. 80 mph, I would get around 16.
Now, in town. I get 11.9 and that is with me babying it. At $3.40 a gallon, this gets very expensive. On the highway, doing 70, I'll get little over 13 if I am lucky. I have no mods whatsoever on this truck. Everything is stock. The only difference is that I have 285/75/16 tires instead of the 265/75/16 tires. But I had a pair of Mitch. LTX tires that where in the 285 format when I was getting the MPGs that I used to get.
I made a trip up to AL to get some stuff for my girlfriend, and I was pulling a U-Haul back. It was the two axle size, 12x6. It was a little lower then the top of my cab. But coming back, I was getting right at 11.2 doing 70. Hell, I was getting 11.5 pulling 18K!
So something is major wrong! But what can cause this?