On Jun 25, 8:09*am, fast_cars_guy <garling...@tiscali.co.uk> wrote:
> On Jun 24, 9:20 pm, Raja <rajashek...@gmail.com> wrote:
>
>
>
>
>
> > Hi All,
>
> > With the gas prices soaring so high, I thought of shifting to use 87
> > Octane instead of the premium 91 octane. I've read many sites and they
> > suggest using regular gas instead of premium unless one is driving an
> > expensive sports car.
>
> > I read in another site that unless the user's manual says "premium
> > fuel only", one can use regular gas.
>
> > I wanted to know if I could use regular gas in a Spyder GT 2001.
>
> > Thanks in advance,
>
> > Cheers
> > Raja
>
> I suggest you search google and read about the meaning of "petrol RON
> number",
> then after some further research you may come to the conclusion which
> I came to:
> [this is MY conclusion, it may be NOT correct]
> one need high RON fuels in sports (or any other high compression
> ratio) cars.
> The compression ratio in different cars varies between 7-9 to 14+,
> with age [of the engine] the compression ratio is falling bellow the
> original figure too.
> So, if you have a car with NOT very high compression ratio (bellow
> 10-12) you do not need high RON fuel at all.
> By the look at the web I would says your car's compression ratio was
> NOT higher then 10 (:1) when new, so you should be reasonably safe,
> but listen to pinging knocking sounds when you start using it...- Hide quoted text -
>
> - Show quoted text -

Thanks for the info. I could see that most of the sites posted the
compression ration as 9:1 but I did not find info on the type of fuel
to be used for a 9:1 compression ratio cars.
However, I aslo see that most of them mention the basic fuel at 91
octane and premium at 95/98. But the gas in US is 87 Octane for basic
gas.
I am confused 'cos if we can use basic (which is 91 for themj), then
it is premium gas here.

Am I wrong?