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Old 10-18-2018, 05:07 PM   #17 (permalink)
redpoint5
Human Environmentalist
 
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Join Date: Aug 2010
Location: Oregon
Posts: 12,394

Acura TSX - '06 Acura TSX
90 day: 24.19 mpg (US)

Lafawnda - '01 Honda CBR600 F4i
90 day: 47.32 mpg (US)

Big Yeller - '98 Dodge Ram 2500 base
90 day: 21.82 mpg (US)

Prius Plug-in - '12 Toyota Prius Plug-in
90 day: 57.64 mpg (US)

Mazda CX-5 - '17 Mazda CX-5 Touring
90 day: 26.68 mpg (US)

Chevy ZR-2 - '03 Chevrolet S10 ZR2
90 day: 17.14 mpg (US)
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My Acura has a MAP sensor. Is one inherently better/worse than the other?

If I understand correctly, the ECU doesn't know what the AFR actually is, it just knows how much O2 is going unburned, and adjusts fuel to target stoich, so it doesn't really care if it's ethanol or gasoline.

I've never seen my car go more than 40 degrees advance, so I'm not sure if there is any benefit by going more advanced than that, or of the car is even capable to do it. Of course, the car could tolerate more advanced timing under load with higher octane, but I'm not sure that's much of a benefit considering most of the time is spent cruising, not accelerating.

All that said, Nothing over E10 is readily available in Oregon. I just found a pump with E0 premium (92 PON), but it's $1.20 more expensive than regular 87. I might try blending with regular (E10) to see how it affects MPG.
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