Agreed with both above. There'* a good reason it says "Premium Fuel ONLY" by the gauge. It'* the most cost-effective fuel, and the difference in price would take a HUGE margin to make a difference. Best bet is to just used what you're supposed to here.

Actually, if I am going to make an interstate trip, especially out here in the flat Midwest, I'll put regular in. Since you aren't putting any load on the engine while you're just cruising along, I figure the knock sensor will never come into play and so regular should work just fine.

You'll only notice heavy timing retardation under heavy loads. Otherwise, under cruising conditions, there just may be a constant light KR that will effect long mileage runs.

you could, but the amount of $$ you spend on octane booster would probably be more than what you'd actually pay for gas

87 octane gas may not burn as efficiently causing carbon buildup and hot spots in the cylinders. This will cause KR if done enough even under lightload conditions.

With what you were saying about the carbon buildup on the cylinders, what if 87 octane was always run in your car, would running premium do anything to help?

btw,its n/a

Lower octane doesn't build up more carbon in the cylinders, on N/A. It'* timed for 87.

Premium has helped me get higher milage on the freeway with an intake. Otherwise with a stocker it'* worthless.

Around Mankato 87 and 89 are the same price :? .

Why fill up with 87 when 89 won't cost you anymore?

Because your computer takes 100 miles to adjust to a different octane, so if you go up to the cities often (me) then you should stick to one octane. 89 doesn't do much for me, I thought i've felt it before.

However i will run 89 during the year...

I never had a problem when I filled up with 87 leaving town and while in other states to fill up. Then when I was close to home and had a 1/4 tank I would put the my normal octane i would run in there. Never had a problem and saved money. Good to blow the carbon out. I figure why put in 93 (accept for sc) when ypur gas is burning anyway? If you stay in a city I would do this. The gas is going to burn more leaving depending on how far you rtravel and then on your way back to the home state you notice that you dont burn alot of fuel. I did this with my 97 SSE and my moms Maxima.