Our first attempt to compare the performance of 91-octane, pump premium gasoline to E-85 was at Southwest International Raceway in Tucson, Arizona. The Charger weighed in at a hefty 4,256 pounds, but ran 11.60s at 118 mph with a 5,250-foot density altitude. We were impressed with the power, but it was consistent results we were after, and three problems emerged. The Charger is a street car with no line-lock for consistent tire heating; it has a production shifter that occasionally goes from first to third, not first to second to third; and we were running entirely too close to the NHRA limit of 11.50 seconds without a rollbar. We were at risk of being barred from the track if we happened to make a really good run. So it was off to the dyno.