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Re: [Phys-l] Hybrid mileage

I think less of a diff. than suggested by formulations. [Incidentally, the winter 'line has a higher vapour p. also for easier starting.] as the gasoline is colder so more in a ga (denser). None of you have suggested the real (bc's) reason; the air is denser colder and there's more water in it. also the water (snow for you unfortunates) on the road increases the rolling friction. I verified this (anecdotal) by traversing the same path the same day w/ and w/o rain. Made a v. sig. diff, but I didn't record it.

Since the batt. is in the 'bile I suspect T. not different; especially as one is not to cover the cooling vent -- over heat the batt.

I haven't looked, so guess the CC is well insulated. will obtain T very quickly.

bc realizes the majority (all?) of his claims may be verified w/ a little physics checking.

p.s. I've noticed (anecdotal) that very cold dry days lower mileage --tyres less inflated??

On 2010, Jan 05, , at 15:49, B. Esser wrote:

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
difference between summer/winter blends can be as much as 3-4% based on a
Wisconsin study.

Bruce Esser
Physics Teacher
Marian High School

Forum for Physics Educators