Don't worry about the octane rating. Use whatever you want, unless you
get knocking. Then go up to the next grade. My '72 runs fine on 87
(regular in most places). I don't remember exactly, but your '71 may
have higher compression. I think there was a change in '72.
Jim Ruwaldt
'72 TR6 CC79338U(being restored)
On Mon, 16 Jun 1997, R John Lye wrote:
> On Jun 16, 1:38pm, Joseph Burlein wrote:
> > The car was originally made to run on 99/100 octane.
>
> Ahhh, but the method for reporting octane numbers changed some
> years ago. There are two methods for measuring octane rating,
> research and motor. One gives about a ten point or so higher
> rating than the other (and I can never remember which is which).
> This 99/100 requirement is for that higher rating; the new method
> that is posted on gas pumps in the US is an average of the research
> and motor ratings, and is about 5 points lower. So, susbstitute
> about 93 octane for the above number using current octane ratings.
> Of course, if the engine is modified for higher compression, you
> mayy actually need that extra octane...
>
> > The only way to get
> > that octane is to buy 100 low lead from an a local small airport. Of
> > course, that gets expensive fast if you are driving it every day! Others
> > may agrue, but put in the best (ie: highest octane) gas you can buy.
>
> A good grade of premium fuel should be fine for a stock engine.
>
> John Lye
>
> rjl6n@virginia.EDU
> http://avery.med.virginia.edu/~rjl6n/homepage.htm
>
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