Gas thread

[ceo012384]

Originally Posted by Gas Man

Yes ethynol is cheaper... and in the winter they inject butane in the gas as well!!!!

Anymore Dlit... ethynol is always added to everything... I'm just saying that its a cleaner, it really is just de-natured achohol.

So isn't the main problem that Ethynol provides less energy when it combusts, and also burns at a different speed than typical gasoline?

Thus that is why bikes (which require more precise air/fuel mixing and higher octane due to high rpms) don't work well with anything more than 10% ethynol?

Wouldn't running a higher-percentage ethynol blend be similar to running too low of an octane, i.e. you would get detonation and pinging?

Originally Posted by dubbs

Does the butane in the gas have any effect on MPG?

I've noticed in my 40mpg beater that we average a bit less now, doing the same driving, then in the summer..

Originally Posted by Cutty72

Probably cause it's cold out.

1. you may let it idle more, to warm up.
2. cold air is more dense, thus, more air is run into your engine. more air means more fuel.

The warm up and idling stuff is a good point.

Also, you're generally travelling slower and thus getting worse mileage.

But the cold air part... I don't think so... the same amount of fuel is injected each time the injector squirts... but since the air is denser, the compression ratio actually goes up and the engine is MORE efficient and makes MORE power with the same amount of gas.

Also, the cooling system (radiator fans and such) need to do less work to keep the engine at optimum temperature... which would increase the mpg theoretically...