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When I blew my B16, I was rather upset at the thought of having to drop a larger displacement engine in, especially one with less peak power output. Oddly, I found that I improved my mileage when I swapped for an LS motor. After doing some reading, I can only conclude that it's some combination of leaner burn and the fact that the B16 is oversquare and the LS is undersquare.
The old D series might have been better for these purposes, though there's probably a lot of room for improvement in the B16 if you're willing to tune for economy.
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