The lone change will be in the fuel. Ethanol, which is made from corn, will be used following a season in which it is mixed with methanol, the current fuel.
Barnhart said no additional manufacturers have shown enough interest in the IRL to make him optimistic that they will join Honda for 2007. Chevrolet will leave the league after this season with Toyota to exit after 2006.
Barnhart said he is still weighing the effect of removing the stipulation that all engines must carry the label of an auto manufacturer. "We've had a lot of interest from suppliers (of race engines), but I still think we're better off with manufacturer support," he said. "The problem is, if you release (the label stipulation), you make (the IRL) less attractive for future manufacturers to join." Indy Star