Causes for lowered gas preformance?

[dswalterwi at gmail.com (Don Walter)]

I can tell for a fact that different brands of gas can make a huge
difference.  After running for almost a year on Shitgo (Citgo) a Shell
station opened near my work.  Now I have always been a fan of Shell.  What I
am going to tell next I was not trying to make comparisons but immediately I
noticed at least 5mpg better mileage and much more power.  I have heard this
from several other people that switched as well.   I am also a fan of Mobile
and have had good luck with Standard (now BP).  I will never use Shitgo
again.

On 12/17/06, C Boyko <roccit_53@scirocco.cs.uoguelph.ca> wrote:
>
> Yep, that's one thing, driving style. It may be where you're driving it
> too, the old city vs highway thing. (starts/stops/idling vs cruising.) But
> if it's your car (ie, aerodynamics/driver aren't a factor) and that hasn't
> changed, it goes down to efficient combustion I'd think. Anything too rich
> or too lean will dump unburnt HCs down the tailpipe, and these are capable
> of providing energy if burnt completely and at the right time.  Leaky
> injectors / cold start injectors could piddle fuel in, and a bad spray
> pattern would make it harder to burn too. And then there is the
> possibility
> that the distributor isn't providing an even mix, and the car is tuned a
> bit rich to keep the lean cylinder(s) happy. And then there's spark, if
> it's not firing well or at the right time, same deal I'd venture, unburnt
> fuel (or loss of the potential to turn the crankshaft as efficiently as
> possible). Then there are other things, like tire pressure and all that
> drivetrain loss of go-forwardiness due to friction.
> Just buy a TDI :)
> Cathy
>
> On 1:57 pm 12/17/06 Tonee Northam <pb3vr6@yahoo.com> wrote:
> > The right foot being larger or heavier than the left.
> >
> >   Atleast that's what my problem is.
> >
> > Neptuno <neptunonc@yahoo.com> wrote:
> >   Like the tittle mentions:
> >
> > Quick people what are the main causes for lower gas performance?
> > The car is running smooth. There is a leak at the muffler, but does
> > that matter? It was timed last this past summer at Dan Bubbs or was
> > it last year?
> >
> > Thanks,
> > EL Tony
> >
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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)