With that said, I think about an 8,000-lb trailer is the biggest I'd ever pull with the 8.1L. Its not a fuel economy queen, but its a lot cheaper than a diesel overall, and they start when they're cold. Haven't had a lick of trouble with the motor at all or trans at all, and this truck pretty much doesn't even leave the driveway from december till june unless its got a trailer behind it. Same mileage with the 265's as 285's with either a 4,000-lb trailer or a 6,000-lb trailer. It doesn't matter what trailer tack onto this thing, it gets 9 mpg towing. I get about 13.5 unloaded on the highway with the 285's, I got about 14.5 with the 265s 70 mph. With the 285s, I lost about 1 MPG, and yes I have my speedo programmed correctly.
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