I got 52000 miles (and 9 years) out of the Generals that came on my 2WD Chevy -- should have gotten about 65000 but I didn't rotate the spare. (I *think* the spare wheel matches.) I replaced the fat P-metric Generals (P255/70R16) with skinny load range D Kuhmo truck tires (LT215/85R16), and it's amazing how much better traction I had this winter, and I'm getting better gas mileage too. When these wear out, I might put Michelin 215's on, but I didn't want to pay that much and then maybe hate the tall skinny tires.
Not sure what to do with that 9 year old General spare tire that's never been on the ground and doesn't match. (Yeah, I know I'm a dumbass)