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If you have turbo or high compression N/A'S like more than 9:1
You NEED to run mid - high octane gas. In a nut shell. the octane rating is how much the gas can be compressed before it spontaniously ignites.
I had a 3000gt N/A with a 10:1 comp stock. if i ran anything less than 91 it was bad for the engine because it would occasionaly combust before the piston reached TDC.
If your driving a sports car, RUN higher octane gas just to be safe. it will extend your engine life and performance.
I look at it like this. Say 93 is 20-30 cents more than 87 ike it is here. that means every 10 gallons, your paying 2-3 dollars more. so thats about 4-6 dollars more per filllup. its REALLY not a big deal if you love your car and love to drive
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