Re: [Phys-l] Hybrid mileage

["B. Esser" <besser@marian.creighton.edu>]

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
http://marian.creighton.edu/~besser