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Re: [St] Using Regular Gas In A Sprint ST?



On 13 Mar 2008, at 12:13, Steve Boudreaux wrote:

> I know what usually happens when lower-octane gas is used, but one  
> near-full tank fill recently, I tried mid-grade fuel.  No detonation  
> that I could hear, power was still fine.  I also know that a  
> vehicle's miles per GALLON drops a bit when using a lower octane  
> fuel, but it's miles per DOLLAR is actually better with the lower  
> octane/less expensive fuel.
>
>  I wonder: if one were doing a mostly Interstate highway trip, not  
> carrying a pillion or excess luggage/gear, and planning on going  
> about the traffic pace (say, 70 to 80 mph), would a Sprint do fine  
> on regular fuel for that trip?  Anyone have any experience with this?

In the UK the recommended fuel for the 955i ST is (AFAIK) 95 Octane  
Unleaded (what used to be called two-star).  This is the 'lowest'  
grade of petrol available.  I'm not sure how it compares to equivalent  
fuels in the US.  In the UK you can also get 97 Octane premium grade  
fuel.  I ride mostly about the speeds you mention, and my experience  
is that 97 grade fuel in the 955 ST leads to slightly smoother  
running, and slightly better mileage, but nothing so amazing that  
you'd which fuel you used.  On a trip around Europe I also tried some  
of the 'super fuels' sold in Italy - 98 or 99 Octane.  As with the 97  
grade fuel, the ST ran slightly better with the fancy fuel, but not so  
much that you'd really know if you just got on the bike without  
knowing which fuel was in the tank.

I'd agree with Rik.  I really don't think it makes enough of a  
difference to really matter, unless perhaps you are riding high up in  
the power output/ speed stakes.  But since this is seriously illegal  
on public roads, all a bit academic.

Regards

Gavin

ST'03

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