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I'm starting with a 5spd v6 s10 with a blown motor. Im probably just going to rebuild the v6 for reliability and simplicity.
I was considering a v8 or even diesel swap but i have done swaps before and the cost, mantinence and all the unknowns that go with a swap would probably negate any potential savings in gained fuel economy. Same problem with a turbo, turbo ing an engine is always less reliable and the cost of the parts and need for premium fuel would make the savings from potential mpg gains less significant.
I've had a few s10s.
I've learned that these trucks get their best economy around 55-60mph any more and it starts to drop.
Maybe start with a tune up using quality parts and swap all the fluids for synthetic. Skinnier tires may help when the time to replace them comes.
If the truck goes good at 70 but the engine is lugging around town, swapping the rear end to a deeper gear will hurt mpg on the highway but may help in town.
A free flowing exhaust with a lighter/ smaller muffler may be worth trying too
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