Octane gas
#22
RE: Octane gas
yeah falk is right; the higher compression the higher the octane, which means the higher concentrations of heptane.
heptane's boiling level (or in our case combustion level) is about 35% less than that of iso-octanes found in our fuel; hence you get worse gas mileage... it's not because your car uses more or anything else someone might state.
i haven't researched too much on the flex fuel; but i'm not buying into that yet anyway...
now... does anyone have any arguments over the "brand" of gas you buy? ie, Chevron vs RaceTrack vs 7-11, etc?
I mostly buy from RaceTrack, seems to be a stable fuel source at decent prices.
heptane's boiling level (or in our case combustion level) is about 35% less than that of iso-octanes found in our fuel; hence you get worse gas mileage... it's not because your car uses more or anything else someone might state.
i haven't researched too much on the flex fuel; but i'm not buying into that yet anyway...
now... does anyone have any arguments over the "brand" of gas you buy? ie, Chevron vs RaceTrack vs 7-11, etc?
I mostly buy from RaceTrack, seems to be a stable fuel source at decent prices.
#25
RE: Octane gas
Gasoline sources are local or regional.Brand XYZstations in California get gas from one refinery or terminal, while the same brand stations in Ohio get it from somewhere else.
Blending is different around the country, especially in winter. There's abunch ofdifferentwinter-blend gasolines around, and probably different blends in summer too.
My personal guess is the really big names like Shell, Mobil, BP are probably pretty consistant across the country. Smaller brands may be OK here but not OK there. Are you confused yet?
And anti-knock requirements ('octane') are more complicated than just compression ratio.
Blending is different around the country, especially in winter. There's abunch ofdifferentwinter-blend gasolines around, and probably different blends in summer too.
My personal guess is the really big names like Shell, Mobil, BP are probably pretty consistant across the country. Smaller brands may be OK here but not OK there. Are you confused yet?
And anti-knock requirements ('octane') are more complicated than just compression ratio.
#26
RE: Octane gas
ORIGINAL: JimBlake
And anti-knock requirements ('octane') are more complicated than just compression ratio.
And anti-knock requirements ('octane') are more complicated than just compression ratio.
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longhornjohn
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05-16-2006 02:42 AM