Mid Grade gas vs High Octane gas - better performance??

[dswalterwi at gmail.com (Don Walter)]

I have always run premium.  I switched multiple times from Citgo and Shell
in Fort Atkinson (just north of Janesville here in Wisconsin for those out
of Staters) to test the difference in perfomance and mileage.  I noticed a
significant differnce in both with shell gas over the citgo.  Shell was much
better.  I haved talked to many people about the same experience with
citgo.  Overall I like Shell the best of all.

Ben put the Mid grade gas in from Kwik Trip which I have had good results
from as well.  Sometimes it seemed even better than Shell.

Back to my son's problem.  He said that the car was idling high today which
leads me to belive that the idle valve was leaking a bit.  We had to buy a
O-ring from the hardware that wasn't the exact size and I suspect that may
not be sealing properly otherwise there may be a leak somewhere else.
Tonight when we went to look at it again it idled fine.  I used a simple
static timing light to check the timing and it seemed a bit advanced at idle
and at about 1500 to 2000 RPM.  I will have to have him check the timing at
work with a adjustable timing light at work.


On 3/13/07, Rob Calderwood <robcalderwood1@charter.net> wrote:
>
> Don,
>
> I talked to a manager of a Citgo in Janesville a few months back. He
> admitted the regular and mid-grade come out of the same tank in the
> ground! Only the premium has its own tank. He said the regular meets the
> mid grade octane rating.
>
> Rob
>
> Don Walter wrote:
> > My son's 1.8L 16V swapped engine was running pretty good but he felt
> > that it
> > was lacking power a bit in the mid to higher RPM's  Initially we
> > thought it
> > might be either running too rich or too lean.  I haven't had a chance
> > to put
> > a meter on it to find out.  Today he filled it with Mid grade (89
> octane)
> > gas and claims that it pulls strong all the way through the RPM
> > range.  Does
> > that sound right?  Does that support that it may have been too rich to
> > begin
> > with and the more volatile fuel is burning better?  I don't want this to
> > turn in to a science project discussion either so let's keep it at the
> > 5th
> > grade level.
> >
>
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-- 
Don Walter - Waukesha, WI
1986 8V Black Scirocco (Daily Driver)
1984 8V Audi 4000s (RIP 2/14/2006)
1986 2.0L 16V TEC 2 Black Scirocco (see progress at
http://www.cardomain.com/memberpage/708939)
1986 2L 16V Toronado Red Scirocco (Ben's Car)
1988 1.8 16V Toronado Red Scirocco (sold on 3/29/04)
1984 1.8 8V Pewter Scirocco (sold years ago)
1971 Karman Ghia (sold)
1969 Karman Ghia (sold)
1969 Beetle (sold)