Quote:
Originally Posted by Old Tele man
2) Older engines cannot detect and adjust A/F-ratio to accommodate E10 fuel so almost universally loose MPG with E10 fuel.
3) Newer engines CAN detect and adjust A/F-ratio so CAN accommodate E10 fuel such that they often do NOT loose any MPG burning E10.
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Two and three are backwards; The older engines will run leaner if they cannot adjust a/f ratios, and possibly better mpg at the risk of engine damage. Newer cars that can adjust, will add more fuel because of the alcohol, lowering mpg.