I just did a 350 mile round trip with no crickets! Before we left I ran my 93 tank to as low as I could and filled up with 91 Ethanol Free and almost immediately the crickets were gone. I couldn't believe my ears! The ethanol free gas is the only way to go. Luckily they are plentiful around Madison, WI.
This website has a pretty comprehensive list if anyone wants to check out their area.
http://pure-gas.org/
Kill crickets with ethanol free gas