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I did a similar thing on my 90 Honda civic 4-cylinder. I modified the lifters on one of the cylinders that had a bad valve guide such that the valves wouldn't open. Was surprisingly smooth on 3 cylinders and fuel economy went from the low-mid 40s to over 50 once I got the fuel/air ratio right. It was fuel injected but with a single injector so I put a pressure regulator (from grainger) in-line with the fuel line and could adjust the pressure with the twist of a screw. Since the computer was pretty dumb I achieved a fairly stoich mixture and actually saw close to 55mpg experimenting with "lean-burn" by adjusting the pressure a bit lower than stoich.
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