I took the data from over the past 2 years of me buying fuel. This isn't entirely comprehensive, I didn't perfectly record every time I fueled, and I sometimes got other kinds of gas, but this was the bulk of it. I wanted to know whether it was cheaper to get E85 with less mpg, or expensive 93 for better mpg. Also the 23 and 19 mpg just come from the averages I've seen while driving each kind of fuel, I don't record mpg each time I fuel.

Posted by DankHomosapien

5 comments

  3. Not a lot of unmodified cars that can take E85 and also benefit from 93 octane compared to 87 octane. Spending extra on unnecessary premium gas is going to artificially make the E10 seem more expensive.

  4. You used a fixed number for MPG, so the only thing your actually evaluating is cost per gallon. That can be evaluated without all this extra work.
    But overall this is useless because you’re not actually calculating mpg. By assuming a variable, you’re just making a guess at what’s happening.

    Lastly, get Fuelly app, make 2 versions of your car, one on 85 one on 93, and then it does all the math/recording for you to give you a true cost per mile.

  5. There isn’t enough data here to actually draw a useful conclusion. You can’t multiply the gallons you bought by an estimated MPG and directly translate that into a cost per mile, you need the actual mileage from the odometer.

Comments are closed.