This is what I use to measure. I mix 1000ml (about a quart) at a time and use 1000 ml bottles to store my fuel in. I haven't found any good measuring devices for making gallons at a time. Using the 1000 ml cylinder makes figuring the percentages really easy.
http://www.labsafety.com/store/produ...&parent_id=570
I use the #47315.