Related Clues:

• 'The Racer's Edge'
• Nascar sponsor
• Indy 500 letters
• Popular oil additive
• Race car sponsor
• Exorbitant
• Big initials at Indy
• Indy 500 sponsor
• Racing car product
• 60's-70's hallucinogen
• Racer's sponsor, perhaps
• Gas additive
• 'The Racer's Edge' sloganeer
• Big name at Indy
• Indy 500 advertiser