MPG - Why so bad?

[Original Bender]

Not sure about Colorado, but when I lived in the Northeast they would switch to "winter gas mix" in the late fall. This had a higher ethanol percentage, and would kill my mileage.

I’m in oil and gas. It’s exactly this. Because people still drive carbureted vehicles, in colder climates, they have to keep vapor pressure up in the fuel so they can start easily. They do this by using more butane in the winter blend/mix as it has a lower temperature boiling point than higher BTU natural gasolines. If everything was fuel injected they wouldn’t need to do this as mechanical spraying atomizes it enough to start when cold. Direct injection even in gasoline allows for much denser hydrocarbons such as diesel. This is why you can’t have a carburetor on a diesel.

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[23OBX2.7]

Ask around to see what fuel brand Porsche and Ferrari owners are using in your area. One of the service depts or salepersons will tell you.

I have noticed a huge difference with high ethanol, which govts love becaue effeciency drops, use more fuel and they make a lot more gas tax revenue.

After FP tune my effeciency went up a lot.

 

[Jossman 2026]

Was told years ago every 1000' in elevation robs 3% of HP.Fuel injection keeps the air/fuel ratio in balance but you drive harder to compensate for HP loss.

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