Driving around mid-Michigan over the weekend, I couldn't help but notice how much gas prices have jumped in the last few weeks. According to AAA, the national average price for a gallon of regular gas has jumped up 50 cents in the past month to $2.50. Well, this is a good time to have a flex-fuel vehicle if a local Mobil station is representative of a national trend. Filling up with the biofuel around here will save you 38 cents per gallon, which is something to think about even though there's less energy in the corn juice. Actually, according to E85 Prices, the national average difference is about 42 cents a gallon. A gallon of E85 will cost you something like $2.08, they say. What do the signs look like in your neck of the woods?