I switch to pump E85 6 or 7 years ago on my S/P bracket car, that fuel is way more consistent than any other gas or race gas I've used, my S/P car now doesn't vary more then .003 ET in the 1/8 mile from the first run in the morning to the last run in the heat of the afternoons here in central Oregon
My other cars would vary a lot more than that on gas depending on the weather change, some times as much as .015 \
I pay from 3.75 up to 4.20 a gallon at the pump, they sell VP race gas also and the cheapest on, lowest octane, is over $10.00 a gallon
E 85 doesn't go bad in the jugs either when sitting, winter or summer