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...I'm only mumbling an educated "guess" here, but I believe that lean-burn prefers higher-octane to ensure 'smooth-constant' flame propagation across the cylinder without creating combustion-induced "knock/ping" as the flame-front crowds across the cylinder.
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• 2011 Chevrolet Cruze LTZ 1.4LT 6A
• 2009 Pontiac Vibe 1.8L/SFI 4A
• 2004 Pontiac Vibe 1.8L/MFI 4A
• 2003 Ford Focus ZX5 2.0L/Zetec 4A
• 1971 Dodge Charger 318 3A
• 1970½ Plymouth AAR 'Cuda 340/6BBL 4M
• 1968 Dodge Charger 383 3A
• 1967 Plymouth Barracuda Formula S 383 4M
• 1965 Plymouth Barracuda Formula S 273 4M
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