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Interesting. I tried 10 gallons a month ago with one gear higher: ie, always between 2700-3300rpm, both city & highway: my MPG dipped down to about 19. I was thinking that since engines are more efficient, maybe the efficiency over-rides the extra fuel needed to sustain the higher RPM, but appears to be invalid.
Normally, I'm low RPM & high vacuum.
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Porsche Club Racing National Scrutineer
'89 Andial 951
'82 928R
'74 911 RSR 3.6
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