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That the 2007 IndyCar Series will be run using 100 percent ethanol is not news, so we won't repeat what we've told you before (see the links below if you missed things). What we will bring up here, late on a Friday, is that tomorrow is finally the day that the 3.5-liter Honda Indy V-8 engine start using pure ethanol in competition. The race is the XM Satellite Radio Indy 300 on the Homestead-Miami Speedway in Florida. E100 was tested in the cars earlier this year.

While Honda's latest racing announcement is a positivist preview for the 2007 racing season, including F1, IndyCar, SuperGT, etc. What's interesting to us are the E100-ready engine announcements.

Last week the representatives from the Indy Racing League met with President Bush at the White House, where the president heard a bit about the league's use of ethanol to race around in circles. Wait, it's ovals, right? Anyway, the IRL is using an E10 blend of gasoline and ethanol this season and will start using E100 for all races in 2007.

The Indy Racing League has been promoting ethanol this year in preparation for the big switch to using the biofuel almost exclusively next year (see AutoblogGreen's Indy roundup here) and league officials say the fuel has performed perfectly so far. The league's director of engineering, Jeff Horton, said, "We've had zero problems since our first test at Phoenix." Tests since then have included six IRL races. A typical IRL race uses about 6,000 gallons of fuel and the Indianapolis 500 burned 30,0

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