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Not saying any one is making a bad decision here but if they are estimating 40 mpg thats not bad, how ever take a closer look and I beleive you need to run premium which is any where from 30 to 50 cents higher. that will drop your average down too.
I am with james his prism gets 38 and you can run the cheap stuff
30 to 50 cents more is a strech, I have had a supercharged grand prix that requires premium and have had it for 8 years and I would say premium is generally 16 to 20 cents higher I have never seen it 30 cents higher.
I have paid over $4 a gallon though I think 4.01 when regular was 3.85 It gets good mileage though so I do not mind the premium.