I bought a car last september for commuting to offset the miles on my T100 (172k). Keep it fresh for what I really want to use it for. I find I won't start the truck for up to 3 weeks at a time. I was told I should keep the tank full to avoid condensation/rust in the tank. Is there an additive I should use when I "park" it? Should I start it every week or so? I probably should drive it to keep the tires from settling (its always great to drive these trucks when you haven't for a while). What would you do?
By the way I just drove this truck down Baja, MX and back for the second time, NO PROBLEMS, I love this truck. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Ethanol is the additive that helps absorb water in the gas. A partial tank allows moisture bearing air to condense water on the tank insides when things cool down. Same thing happens to deisel. A pint of ethanol, higest purity possible, is what will work. You may note all the talk about 85% ethanol. That's because 100% ethanol is only available in speial containers for lab use. ($$$$$) Within 5 minutes of opening a can, you are at 95 % and the degredation is quite rapid until you get to 85% (15% water).

Soooooooooooooo, now that the chemistry class is concluded the real answer is easy. Fill er up! If you are storing for a while, with only the occasional crank up to make sure all is ok, cram it with gas and forget about it. Save the ethanol for drinking!!!!

I haven't been starting mine for 3-6 weeks at a time for a few months now. No problems except for the square tires, but they're bias and it hasn't been above freezing since the middle of September, so--

If your tires are radials, they shouldn't square up noticeably or at least they should round back out easily.

I do try to store it close to full and stay on a 3-4 month oil change schedule.

thanks for the info, I just drove it the .5 miles to fill up the tank. I watched the tailpipe when I started it, no smoke at all. I have BFG TA's on it for tires. Do those need a regular spin? I'd hate to put any flat spots in them since they are pretty new.

The tires should be fine. Like I said, radials aren't as prone to it to begin with, and they drive round again in no time. I'd even be surprised if you felt it. I've never heard of any damage coming to tires that way unless they were left sitting long enough to dry rot anyhow; it's just what tires do when you leave them to sit with a bunch of weight on them.

Oldest trick in the world from an old guy.................put the vehicle up on blocks so the tires and suspension are off ground. Tires are not flat spotted and the springs / torsion bars are not loaded. No stress, no mess. That comes from nylon tire time if you want to guess age....