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I also have 2 large gas guzzlers in the family. Both 4 wheel drive, and both used for their intended purpose (hauling and commuting when the weather is more than the neon or wife's intrepid will handle). However, they are paid off and insurance and plates for a year for BOTH of them is less than renting a small u-haul for 2 days.
Some things I have done that you can do to the suburban that helped....
1. Synthetic gear lube in BOTH differentials. If it is an 86, it could likely stand to be changed anyway.
2. free flow exhaust (got me 2 mpg highway on the 1/2 ton truck)
3. Synthetic gear lube in the tranny (if it is a manual)
4. front air dam (these sit pretty high...so it will likely not be an issue unless the snow was REALLy deep)
5. Electric fan (already mentioned) or at least check the clutch on the current fan. They had a tendency to seize on these.
Not a lot of aero, I know....but some ideas.
Jim
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