90q What grade of Fuel? / compression

[L DC]

I used to fill up my VW Quantum Syncro with 93 Octane
and got about 400 miles to the tank of mostly city
driving. Normally fill tank up at BP/Amoco

But when gas prices went down, I scaled back to 89
Octane and lately to regular, 87 Octane. My gas
mileage went to 325-350 per tank. Started filling up
at Cumberland, cause is cheaper per gallon.

Last week I decided to fill up with 93 again (but this
time at Cumberland) and was quite surprise to get a
paltry gas mileage result. I had to fill up the tank
after 260 miles of diving.

Same driving conditions applied to all of the above;
Reving engine between 2500 and 3000 RPM and on
occassions to 3500 RPMs when passing.

So the additives each gas brand adds do make a
difference.

I for one won't be filling the tank with premium at
Cumberland because I actually get worse results than
when I use their lowest grade, 87.

-Regards to ALL!!

-Louis


 




  


Following the crazy rise of gas prices, I 




--- Lyle <lws at o-o.yi.org> wrote:
> I mix 93 and 87, too.  I don't notice performance
> changes during daily
> driving from running anything from 89 to 93 octane,
> but I don't have a good
> technique for measuring that.  I've been trying to
> use mileage as a gauge,
> but it's not conclusive.  The S8 runs 11:1 stock,
> and Audi recommends 92
> octane for that engine, so I think you should be
> fine.
> 
> -----Original Message-----
> From: quattro-bounces at audifans.com
> [mailto:quattro-bounces at audifans.com] On
> Behalf Of David.Payne at brinksinc.com
> Sent: Tuesday, May 10, 2005 10:15 AM
> To: quattro at audifans.com
> Subject: Re: 90q What grade of Fuel? / compression
> 
> 
> I mix 93 and 87 in a 2 to 1 ratio.  Gives me 91
> which is what is recommended
> in the owners manual and on the fuel filler door. 
> Haven't seen any
> performance gains by running straight 93.  Have run
> 87 and 89 and
> experienced lower performance, knock sensor is
> working, I don't have any
> perceived knocking.  Many places in the country 91
> is the highest you can
> get which is exactly what you need. New (similar)
> subject:  I plan on
> starting on an engine build in the next 6 months or
> so and am contemplating
> upping the compression to a max of 11 to 1.  My
> thinking is that if I can
> get away with 91 at 10 to 1, then perhaps with 93 I
> can get away with 11 to
> 1.  I know guys with D series Hondas that run almost
> 12 to 1 with 93 and
> stock engine management. Feel free to chime in. TIA.
> Dave.
> 
> 
> 
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> 


		
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