I love [link=http://hemsidor.torget.se/users/b/bohjohan/convert/conv_e.htm]this site[/link] for making unit conversions.

Maybe others can make sure I'm correct about this since sometimes I have trouble with math. But if you want to mix 90:1, doesn't that mean that 90 parts are gas and 1 part is oil? So that's 91 equal parts? Right?

So by my thinking, you could take the cc equivalent of one gallon, using the conversion site above, and get 3785.4118 cc's in a gallon. Divide that into 91 parts and you get 41.5979 cc's per part. So now you could use the smallest units on your Ratio Rite (cc's) and measure out 41.6 cc's (that's one part). For the remaining 90 parts you just subtract: 3785.4118 - 41.5979 = 3743.814 cc's. Using the above conversion site, you convert to gallons: 0.98901103 Gal. Proving it back: divide 3743.814 by 41.5979 and you get 90 (90:1). It's easy to dispense exactly .989 gallons out of the gas pump.

for 1.5, 2, and 2.5, you can use 62.4 cc, 83.2 cc, 104.0 cc respectively on your Ratio Rite.

When you fill the gas can, you can despense exactly 1.484 Gal, 1.978 Gal, and 2.473 Gal respectively from the gas pump. I hope I'm right and I hope that helps.

Marl Bell