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Air fuel ratio gauge to achieve the correct fuel mixture at idle


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#21 datzenmike

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Posted 10 December 2017 - 10:47 AM

Best mileage is 14.7 to 1 (theoretically) with down hills with light throttle higher than this. High performance... 13 or high 12s or whatever feels best but definitely lower numbers. The gauge won't tell you the best numbers to run, just the numbers you are running at.


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#22 Lockleaf

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Posted 10 December 2017 - 11:17 AM

Actually best mileage is to run lean. Many modern vehicles run in the 15s when cruising. According to the eco-modder guys, one step shy of meltdown is really where you want to be.

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#23 datzenmike

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Posted 10 December 2017 - 11:41 AM

Yes. Better slightly lean than slightly rich and not burning it all up. If lean, running higher compression helps and I think newer cars are now going up in compression. Direct injection can run into the 20s because the fuel is not mixed thoroughly over all the combustion chamber but only in a small cloud around/near the spark plug is at the correct ratio.


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