any pros or cons between the two? its my understanding that the blended gas will damage engines not designed for it and that it will reduce fuel economy. was on here a while ago claiming better economy going from 87 to 91 gas, and virgin1 and shippo told me my claim was false. it turns out... they were right... my wife was filling up with the blended gas bc it was cheaper. i told her to NEVER put that crap in the vagon again!! so the mileage increase was from going to the pure gas.