quattro Digest, Vol 6, Issue 24

[Larry C Leung]

What you are doing is fine. By concept, you should be doing proportions,
but 50%/50% is probably quite adequate for 87/93 R+M/2 octane fuels. 
Wouldn't do this if you had a turbo car, but you don't have one, so it's
fine.
I did it with my 10:1 A2 GTi in the off season when I had that car, back 
when the fuel prices were about what they are now. 

LL - NY


> Date: Wed, 7 Apr 2004 06:38:22 -0700 (PDT)
> From: William Magliocco <magliocc at rocketmail.com>
> Subject: mixing for octane (LAC)
> To: quattro at audifans.com
> Message-ID: <20040407133822.32233.qmail at web20515.mail.yahoo.com>
> Content-Type: text/plain; charset=us-ascii
> 
> 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
> "economy" regular.
> 
> Someone will know this answer...and no flaming
> puleeze!
> 
> 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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