Gas has a higher btu rating than ethanol. You will get better milage out
of 100% gas.
Ive never really bothered to check the difference. When I had a 35-40mpg
vehicle driving 15-20000 mile a year gas was cheap ($.80) so didnt care.
Now I dont drive much 5000miles on a bouht new 2005Pilot. If two
stations side by side one blended, one 100% I would go with the
non-ethenol blend 100% gas.