What is the difference between summer gas and winter gas? I thought the reason that gas mileage drops so much is because your car runs richer in the winter to suffice the cold dense air entering the intake? Thanks
Winter Gas????????
- Thread starter pooter WS6
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They change the gas formulation many times throughout the changing seasons. This is to allow the fuel to vaporize correctly at different temps. I believe that the "winter" formulations have less energy content than "summer" fuels. Combine that with cold grease in the driveline and bearings and you get worse mileage.
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"Winter gas" is oxygenated to reduce emissions. Of course gas mileage (and power) drops, so whether or not that makes sense seems questionable.
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Yeah, here in CA they used to use MTBE (and ethanol) and now I think it's just ethanol year round. I get considerable better gas mileage out of state.
Summer gasolines and winter gasolines differ not only in whether they are required to contain oxygenates, but also in their volatility. Actually there are five volatility classes of gasoline and that is why oil companies typicaly refer to their gasolines as "seasonally blended" which is what occurs. When it is cold, a gasoline need greater volatility to insure that engine not only start but keep running until it is fully warmed up. In the spring and summer, the gasoline has to be lower in volatility to prevent the occurrence of startability or drivability problems. The changeover of volatility classes occurs based upon the anticipated minimum and maximum ambient temperatures that is calculated based upon specified percentile values.
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Ambient temperature here during the winter can range from a bit under freezing to over 80 degrees F. I suppose we need Trifecta Blend.
Excuse the spelling, but they change the Reid Vapor Pressure for different seasons.
It has to do with fuel vaporisation to help cold starts.
It has to do with fuel vaporisation to help cold starts.
Yo Dood, can you get non-oxygenated gas across the border in Nevada? I live about an hour from Tahoe, and might drive across to fill up if it's better gas over there. It costs just as much.
We get our gas from Californis...except for eastern Nevada (Elko, Ely, Wendover, etc.)which gets gas from Utah. Gas prices in eastern Nevada are almost always 25 to 30 cents cheaper than western Nevada
We get our gas from California...except for eastern Nevada (Elko, Ely, Wendover, etc.)which gets gas from Utah. Gas prices in eastern Nevada are almost always 25 to 30 cents cheaper than western Nevada.
@%*@%&@...sorry about the double post...
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