Octane

[GPZ1100ABS]

Pete,

Thanks for the info on this. I wasn't aware of this difference. I've 
seen low octane gas (in the eighties) mentioned a couple of times on 
this list and thought that was weird because the user manual says 91 
minimum. But this explains it, thanks for the reference.

In DK there is a law that requires the petrol companies to add 5% bio 
fuel to the gas and 7% bio diesel to the diesel so there is no way to 
avoid this anymore. I think it's the same in Germany, but in addition 
most gas stations there offer something called E10 which is gas with 10% 
bio fuel. From what I hear from my German friends this is not at all 
popular because of lower gas mileage and poorer engine performance. I 
haven't heard of any motorcycle rider would put this in his tank.

The ultralight and motorglider community mostly uses engines that run on 
ordinary car gas and there has been several incidents with clogged 
filters, leaking fuel lines, tanks or carbs because the alcohol eats 
certain materials of which hoses, coating, gaskets etc. are made of. In 
our local flying club we used to pick up gas from the nearby gas station 
using jerry cans, but it turned out that the coating on the inside of 
the cans were dissolved and filled the filters with crud. We use some 
special plastic cannisters now. Normally we have a 100 hour inspection 
interval on the planes, but our motor specialist now performs some extra 
checks related to the fuel system every 50 hours just to be sure.

Den 12-11-2013 00:49, schnowz skrev:
> Ped I'd forgotten the European rating is different to the US.
>   which I believe gives a higher number in Europe for the same gas.
> from Wiki
>   
> On the East coast here most gasoline has 10% alcohol which gives lower gas mileage. It could be that Colorado at that time had no alcohol.
> "In most countries, including Australia and all of those in Europe[citation needed], the "headline" octane rating shown on the pump is the RON, but in Canada, the United States, Brazil, and some other countries, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Pump Octane Number (PON).
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