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This may be blasphemous but you could get a 2.7L 4cyl Toyota engine from a Tundra or 4runner and simply swap the engine. You'd probably have to get a custom drive shaft made and then you could play with different gearing in the rear to optimize fuel economy. I'd be surprised if you couldn't beat 30mpg. Take a look around and see what other rear engine 4cy cars are out there you could potentially do a swap with. A miata might work, I would advise against a Chevette motor. Those cars are one reason I can't bring myself to buy a Chevy today. I'm not familiar with what Chevy has in the S10 or other smaller trucks. Maybe one of those motors might make sense for a swap.
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