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This has been in the works for a year or so, but this weekend's 500-mile race in the Polis of Indiana will be the first Indy Five-Hunnert in history where the cars run a 10% ethanol blend, ahead of a full-bore switch from methanol to ethanol next season. Partially veganated!

Corny? Indy Cars Are Moving to Ethanol [Forbes]

Related:
Indy Racing LEague to Run on Ethanol [Internal]