mixing for octane (LAC)
magliocc at rocketmail.com
Wed Apr 7 09:38:24 EDT 2004
This may appear to be off-list, but it's really not.
Here's my question:
Due to the highway robbery at your nearest gas pump, I
am wondering if I can mix gasoline to my own octane
needs. In SmogLanta, most stations only carry 87, 89
& 93 octane gas. My '93 100 is rated for 91 Octane
gas. All octane figures are the (R+M)/2 variety to
keep it straight.
Let's say I mix 5 gallons of 87 octane gas with 5
gallons of 93 octane gas. Do I wind up with 10
gallons of 90 octane gas at the end? If not, is there
a formula to figure this out?
I understand that gas stations that sell 3 grades of
gas generally have two grades of gas in the
underground tanks. The pump mixes them.
Anyone remember the 5 grade Sunoco pumps-they only had
2 grades of gas feeding the pump, right? What were
the mixing ratios? I also recall they sold a 94
octane on the premium side, and an 86 octane as a
Someone will know this answer...and no flaming
Required Audi Content-I mixed 2.5 gals. of 89 Octane
with 2.5 gals. of 93 Octane gas yesterday in my '93
100. So far, so good. Previous test with 5 gals of
regular a month ago gave me a lousy running engine.
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