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The D16z6 should be similar to your current motor. I drove a 4-door civic EX 5 speed with this motor and got 37 mpg averaged over 6 years. The exhaust and short geared transmission don't help mileage, so you'd want to keep yours if possible (it looks like the earlier D series were exhaust to the firewall, so that might not work). It's got the nice VTEC top end, but I'd think very similar performance otherwise.
To the central question: $2k is a lot of cash. You're getting great mileage as-is, but that's got to be more than what you could buy your own car for. Perhaps you could find something even better for the same price if you search around, especially with the low gas prices.
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