MBC has nothing to do with A/Fs. The only time your MBC is working is when your in boost. So anytime your actually using the MBC your using more fuel. If you want to save gas keep the revs as low as possible and your foot barely on the gas pedal. That is according to BMW.
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- Wil
08 Sienna, limited AWD w/ laser guided cruise control, FTMFW!
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