State urged to test octane of gas

State urged to test octane of gas

There are 23 comments on the The Morning Call story from Jun 15, 2007, titled State urged to test octane of gas. In it, The Morning Call reports that:

Pennsylvania's auditor general is calling on the state to require random quality and octane testing of gasoline at service stations after five consumers complained of tainted gas in eastern Pennsylvania, ...

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Since: Mar 07

Bethlehem, PA

#22 Oct 22, 2009
Talking Hawk wrote:
The added variable now is winter,wind chill across the radiator can and does reduce the operating temp from efficenly burning the fuel.If you have a temp gauge use it.Many engines are operating in a continuos under temp or warmup range.miles per gal.plummets with lower engine temp.
HEAT=Good Fuel in winter weather.

Actually, car engines do better with colder air. Cold air is denser than warm air, and so contains more oxygen per cubic foot, making for more complete ignition and higher efficiency.

If you're running 20W50 oil in the winter, you may be killing your engine, so this is the only thing I can think of that makes cold weather operation less fuel efficient.
Just_Me

United States

#23 Oct 22, 2009
Dennis Mac wrote:
<quoted text>
Actually, car engines do better with colder air. Cold air is denser than warm air, and so contains more oxygen per cubic foot, making for more complete ignition and higher efficiency.
However, the car's computer will compensate for the extra oxygen by dumping a bit more fuel into the mixture. The computer targets a proper ratio. The colder the fuel vapors, the more you'll have in the same volume. The total denser volume of fuel/air will burn more vigorously, but your mileage drops.

In the winter, I consistently lose about 2-3 MPG per tank on just daily trips about 30 miles each way, 70% highway traffic.

Since: Mar 07

Bethlehem, PA

#24 Oct 23, 2009
Just_Me wrote:
<quoted text>
However, the car's computer will compensate for the extra oxygen by dumping a bit more fuel into the mixture. The computer targets a proper ratio. The colder the fuel vapors, the more you'll have in the same volume. The total denser volume of fuel/air will burn more vigorously, but your mileage drops.
In the winter, I consistently lose about 2-3 MPG per tank on just daily trips about 30 miles each way, 70% highway traffic.

You may be right, but I think this becomes a non-issue once the engine reaches operating temp. Excess O2 would be detected by the O2 sensors in the (hotter) exhaust stream, and the ECM would actually reduce the fuel to the injectors.

Of course, we're talking about EFI vehicles, not the carbureted models.

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