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I have a few thoughts on this matter. One of them is maybe switching to a newer 4 cylinder Jeep instead of the one you currently have. The smaller engine would be fine for the low-speed crawl of mail delivery and with the low range would likely not sacrifice too much ability on unimproved public roads. It would also give you an overdrive transmission for highway use. Also consider switching to all season radials instead of mud and snow tires for the parts of the year where you don't need the M+S tires. They would have less rolling resistance and probably give you a little fuel economy.
Have you considered getting a smaller car to use during good weather? something like a Geo Metro would still have good cargo capacity but probably uses 50-70% less fuel at a low-speed crawl through neighborhoods. On days with bad weather you could still use the Jeep but the combination of the two vehicles could potentially save you a lot of money.
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No green technology will ever make a substantive environmental impact until it is economically viable for most people to use it. This must be from a reduction in net cost of the new technology, not an increase in the cost of the old technology through taxation
(Note: the car sees 100% city driving and is EPA rated at 37 mpg city)
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