Posted by John in la on February 19, 2013 at 16:34:04 from (184.38.141.218):
In Reply to: Winter Gas /Summer Gas posted by Straw Boss on February 19, 2013 at 11:34:16:
The differance is the RVP (Reid Vapor Pressure) of the gas. Fuels with higher RVP evaporate more easily than those with lower RVP. Gasoline must have an RVP below 14.7 PSI which is normal atmospheric pressure And this is winter gas. For summer months the EPA mandates an RVP below 9.0 psi or 7.8 psi depending where you live. Some local goverments have even lower standards.
The reason summer gas cost more than winter gas is they can use more butane in the winter gas. Butane is inexpensive and plentiful but has a RVP of 52 psi
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Today's Featured Article - The 8N and the Fox - by Zane Sherman. Dec. 13 1998, Renfroe, Alabama. Last niht I dreamed about the day that I plowed the field of about 10 acres over on what Jimmy and Dandy called the Ledbetter field. I was driving the 1948 8N Ford tractor that Jimmy bought in 48 new This was prebably in about 1951 and maybe even befor the house was built. This would have made me to be about16 years old and I drove the tractor for nothing and would have paid to drive it if I had had any money which I didn't, but neit
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