Many small engine manufacturers specify "91 octane" fuel. What most folks don't notice is that the spec is actually 91 Research Octane Number (RON). The pump rating in the US in Canada is NOT RON but rather the average of the RON and Motor Octane Number (MON). 91 RON is more or less equivalent to 87 octane in the US. In other words, regular unleaded gas.
Note that octane has ABSOLUTELY NOTHING to do with the long-term stability of gasoline. It is strictly a rating for knock resistance. It's true that 100LL avgas is quite stable, but that has nothing to do with its octane rating. Rather, avgas must have a Reid Vapor Pressure rating of no more than 7 psi. Auto fuel, on the other hand, may be as high as (I think) 14 psi RVP, but that would be unusual. Refineries raise RVP in the winter and lower it in the summer.
There are a few ways to get low RVP fuel. The surest way is to use avgas. You can also purchase the ready-mixed power equipment fuel in a can. Lastly, if you happen to live in a state or metro area with specific RVP requirements (such as California), your pump gas will comply with the local requirements. You can find those local requirements at the link below.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - A Cautionary Tale - by Ian Minshull. In the early 1950s my father bought an Allis Chalmers B and I used it for all the row crop work with the mangolds and potatoes, rolling and the haymaking on our farm. The farm and the Allis were sold and I have spent a lifetime working on farms throughout the country. I promised myself that one day I would own an Allis. That time event
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.