[88Racing]

Originally Posted by JackandJanet

In spite of the fact that gas prices WILL ultimately go up, pay attention to the spread between regular and hi-test. Here in Arizona, for instance, the difference is about 20 cents. 91 octane costs close to $2.00. It's simple math to figure the percentage difference: Using hi-test as the baseline, 20/200 x 100 = 10%! If the cost of hi-test goes to $3.00, but the difference between it and regular stays about the same: 20/300 x 100 = 6.7% difference! I think, during the last gas price spike, that's about what happened - the price differential was not much different.

So, if you can get better gas mileage using the expensive stuff, you do even better as gas prices rise! Because your mileage improvement percentage stays the same! Sure, you are paying more for a tankful, but we all are.

You can do the math on mileage too. I get about 15.5 mpg on the highway now using 87 and Bill's custom tune. If I chose to burn 91 octane and could get 16.5 mpg, I'd be getting (using the higher mileage as a baseline): 1/16.5 x 100 = 6.06% better mileage. If I was able to get 17.0 using the high-priced stuff, it would be a 1.5 mpg improvement or: 1.5/17 x 100 = 8.8%!

So, it's entirely possible it would cost you less to fill with the expensive stuff if gas prices go up (and they will)!

Keep accurate records, because it might have an effect on your wallet!

- Jack

Hey Jack,

Ever thought of publishing a supplemental guide to go along with the gryphon?
The way you lay out your thoughts and numbers on paper is amazing!

Lars