Op-Ed: There's a blog post over at CNET about an E85 Dodge Viper  which is breaking speed records . They wrote, "More than doubling the horsepower probably had a big effect on the performance of the car, but the extra octane can't hurt. Ethanol also cuts down on the greenhouse gases from the tailpipe." Okay, but as a friend of mine who transplanted a Mustang 5.0 V8 into a Miata  always says, "There's no replacement for displacement!" I'd like to know how E85 compares directly to 92/93 octane from ordinary gas stations. Use the comments form below.