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Re: [Phys-l] Hybrid mileage

On Tue, 5 Jan 2010, WC Maddox wrote:

"Remember the oil companies put oxiginaters in in winter for easier
starting. Cuts down on power. They also don't care if you use more.
Witness their profits. Nor do the FEderal gov't - 18.6 cents per gallon
tax and states, anywhere from $.07 to $.30 per gallon tax."

Summer blends of gasoline run about 114,500 BTU's per gallon with a federally mandated range of 113,000 minimum to 117,000 maximum.
Winter blends average 112, 500 BTU's per gallon with a variance from 108,500 to 114,000. The summer/winter average difference is 1.7%.

If you are in an area where RFG (reformulated gasoline) is required then the difference between summer/winter blends can be as much as 3-4% based on a Wisconsin study.

Bruce Esser
Physics Teacher
Marian High School