I don't think anyone has said it this way, or thought about it from this angle, but bicycle infantry would be a cheap and effective replacement for motorised infantry. That way, you can save your fuel for MBT and leave the IFV at home.
And another, more non-military thought: with the scarcity of petrol/gas and the difficulty in producing fuel alcohol in large volumes, I think that the value of horses (and oxen) goes up dramatically on farms. A combine or tractor doesn't do you much good when it's stuck behind the barn with an empty tank. A team of horses can pull a plow or wagon, and can also do any number of useful jobs around a farmyard. What would be absolutely back-breaking work is done by a human is just hard work for a horse or two.
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