Go to pure-gas.org for addresses & a great zoomable map for the nearly 5000 stations selling 100% ethanol-free gasoline. Sounds like a lot, but ony about 10 in every 350 stations sell 100% ethanol-free gasoline. After switching to 100% pure gasoline, our 3 cars increased their mpg by 8%,7-8%, & 6%. The 3 engines are smoother, quieter & don't need shifting down as much, while ascending hills. You may pay more for it, but I get gas at an excellently priced 100% gas station at the 2100 block of Broadway, Everett, WA, which sells for only pennies more than the cheap Arco 10% ethanol gasoline.

 

45 mpg today in 2012 Sonata SE mix of urban and highway in Buffalo. Same last month mostly highway in Canada. Eco off (always slightly WORSE with ECO on !). I drive at speed limit when I can 55 in NY State and 60 in Canada.