Mileage in My 1967 Mustang by Grade of Gasoline

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 1967 Ford Mustang. I have found these results interesting, I hope you do as well.


Fuel Grade

Have you wondered if it is worth paying that extra dime or nickle to bump up to the higher grade of fuel when you're standing at the pump? Here's what I have found for my car over the last few years. You may find this useful, however, I think I am seeing a higher correlation between actual octane rating of the fuel and my mileage experience.

Of course, there will be variations from car to car, etc... So don't expect your results to exactly mirror these.

GradeNumber of EntriesAverage MPG
Regular Unleaded 131 16.68
Super Unleaded 4 19.21
Unleaded Plus 61 18.53

I, of course, make no guarantees about what kind of gas mileage you may receive in your vehicle, even if it is a '67 Mustang with an L200 and a couple hundred thousand miles under the hood, because there are way too many variables that come into play...