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If you buy a $40-50k car and can't afford the extra $.20 per gallon you should have reconsidered your purchase.
Aside from the knock sensor killing the engines power, you'll most likely notice you're losing fuel economy as well. I did this as a test on my Acura (which was tuned for 91) and noticed I consistently got 2-3mpg less when driving with 87, aside from the power difference. Which basically translates to the 10% worse fuel economy negated the 5% I was saving per gallon.
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Current: '20 X5, '18 M3 ZCP
Previous: '11 E90 335i, '11 E90 M3, '16 VW GTI, '15 M235i, '13 335i, '08 TL-S, '00 Corvette
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