Re: [ST] RE: the fuel thread...

[Craig Tate <craigtt@xxxxxxxxxxxxx>]

Close, but no cigar.  There is no conversion from RON to MON - both are 
determined values.  Unfortunately, Triumph only provides the RON  of 
95.  Without knowing the MON (you have to test for this), you cannot 
calculate the (R+M)/2.   Although 89 is probably a good guess. Check out 
the following site:  http://www.osbornauto.com/racing/octane.htm.  As a 
suggestion, if you're running premium, try mid-range.  If it knocks, go 
back to premium.  The former owner of my 01 ST ran regular.

At 03:32 PM 7/8/2003 -0400, Heyer, Matthew A. wrote:
>That is just not correct.  The Triumph book (on my 2001 Sprint ST) states 95
>RON (Research Octane Number), which converts to 87 MON (Motor Octane
>Number), and thus PON (Pump Octane Number, or better known as R+M/2) is 91
>octane.
>
>Here is a link for further information on the conversion:
>
>http://www.btinternet.com/~madmole/Reference/RONMONPON.html
>
>
>
>Date: Tue, 8 Jul 2003 07:24:05 -0700
>From: Keith Winter <kwinter@xxxxxxxxxxxx>
>Subject: Re[2]: [ST] Mobil Premium Fuel
>
>Exactly; it states 95 RON, not 95 RON + MON /2.  95 RON
>equates to 89 R+M/2.  Don't waste money on more expensive
>slow burning fuel.
>
>- -Keith
>'00 RS
>
>
>Date: Tue, 8 Jul 2003 08:56:35 -0400
>From: "Rod Brown" <rodneybrown@xxxxxxxxxxxxxxxx>
>Subject: Re: [ST] Mobil Premium Fuel
>
>Howard,
>The Owners Manual for my 2002 says 95 RON.   The best I can find around here
>is 93 or 94 pump octane ( RON + MON / 2 ) .  The mechanic at my Triumph
>dealer who I have a lot of confidence in says "run the good stuff".   I
>totally agree with your point about wasted bucks but I always run what the
>manufacturer states or better.  Maybe its those engine mods that changed the
>fuel requirements??? By the way my first three tanks were 47, 48, and 47.8
>mpg - man I can't
>believe that!!!   Not running slow either.
>Rod
>- ----- Original Message -----
>From: <serlick@xxxxxxxxxxx>
>To: <alexanderarchitect@xxxxxxxxxxxxx>
>Cc: <ST@xxxxxxxxxxxxxx>
>Sent: Tuesday, July 08, 2003 9:08 AM
>Subject: [ST] Mobil Premium Fuel
>
>
> > Hello All:
> > The Owner's Manual clearly states that 89 octane or equivalent fuel
> > should
>be used in the ST. You are wasting your $$$ by using anything else. You
>won't get better mileage or performance by spending your hard earned dollars
>on the "better" stuff.
> > Be safe,
> > Howard Stephen Serlick
> > '00 Blue ST
> > Philadelphia
> >
>
>
>On Tuesday, July 8, 2003, 5:56:35 AM, Rod Brown wrote:
>
>
>
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