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70l tank in a Supra.
87oct = $94.43
91oct = $98.63
94oct = $104.23
Less than $10 difference to fill with the best fuel per tank.
Engine rebuild due to detonation $3800+.
Spend the money on the proper fuel for your car. You only save in the short term when you skimp on fuel.
Honestly tho, if you can not afford an additional $10 per fill up to fuel a "sports car" then you need to be looking at a Prius or something.
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