Ok... I have a question about gas prices and different octane grades and car performance.

I am about to give some figures and I want to see what people say about these figues.

If...
87: $2.80
89: $2.90
93: $3.00

And the cars' (just any car, not particularily the S2000) manual says that it is suppose to take 89, what would happen if the car got 87 or if the car got 93? Would 87 make the cars' gas mileage go down and would 93 increase the gas mileage? Or would there be no change in gas mileage if the alternative octanes were used? And if 93 did increase gas mileage, would the 10 cent difference per gallon be worth it?

 

I believe the S needs a minimum octane of 91, not 89. As to the rest of your question, it probably depends on your driving style.

 

There was a similar thread a few weeks ago asking if you could mix 93 and 89 to get 91 and save a few bucks. Unless you drive a LOT, you're looking at saving a few bucks a month, and you're likely to lose at least some of that to poorer gas mileage.

The short answer is, just use premium.

Assume that you can use 87 with no mileage hit, and you save .20/gallon or 2.60/per tank, best case. The cost of the fillup drops from 39 to 36.40 for a savings of 6.7%. You need to fill up more than 7 times a month to save $20.

Also, in reality, you will probably lose some MPG - if your mileage drops from 25 mpg to 23.4 mpg (a loss of 6.7%), you save nothing and may even lose money if it drops more than that.

 

Thats exactly what I am talking about. I want to ponder the whole quetion about, if you lose 2 mpg using 87 would it be worth it to spend 10 cents less per gallon? I know that it's time consuming, but its just something to write about today.

 

No

 

[QUOTE=nastinupe1,Oct 6 2005, 10:25 AM] Thats exactly what I am talking about.