Mileage by Brand and Octane for My 1976 Toyota Celica

Gas Mileage

Here's some interesting trivia about gas mileage. Have you ever wondered which brand, grade, or octane rating gives better gas mileage? Well, I've collected thousands of miles of data on a wide variety of brands, octane ratings, grades, etc. All this information is from my 1976 Toyota Celica. I have found these results interesting, I hope you do as well.


Octane Rating by Brand

So, the first question I got from someone when I showed these gas mileage calculations off, was "What about octane of specific brands - that would probably be more useful." So, here it is... Gas mileage results from my records for different brands at specific octane ratings.

Only combinations that have been recorded more than 10 times are listed to try to eliminate deviant results.

BrandRatingNumber of EntriesAverage MPG
Cennex 85.5 176 22.11
Cennex 87 56 19.71
Cennex 88 26 20.94
Cennex 91 16 21.04
Citgo 91 14 22.44
Conoco 85 68 16.53
Conoco 85.5 137 20.94
Conoco 87 24 20.8
Conoco 88 55 17.32
Conoco 91 107 17.09
Exxon 85 36 19.49
Exxon 85.5 100 21.18
Exxon 87 77 20.22
Exxon 88 37 18.94
Exxon 91 51 17.74
Holiday 85 16 18.53
Holiday 85.5 103 18.78
Holiday 87 15 23.39
Holiday 88 38 20.57
Holiday 91 24 19.38
Mini-Mart 85 18 13.1
Safeway 87 40 21.3
Sinclair 85 21 19.08
Sinclair 88 14 19.91
Sinclair 91 14 20.54

I, of course, make no guarantees about what kind of gas mileage you may receive in your vehicle, even if it is a '76 Celica with a 20R and nearly half a million miles under the hood, because there are way too many variables that come into play...