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I agree, stoichiometric mixture is best for power with pollution in mind, richer gives more power with disregard to pollution & in piston engine planes you definately want to err on th rich side. :) You can also go a fair bit leaner than stoichiometric at part throttle for economy. With D-Jet & SU cars I try & make it feel a bit wheezy feeling at part throttle, ie, get the highest vacuum possible & then lean it out a little more so the vacuum drops, but not so far that you get misfires.
Cheers,
Paul.
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