can someone verify my math please.

6.2 math wrong

 

First and foremost, how do you know that each time you filled the tank you filled it to the precise level? If you don't quite fill it up this tank, your MPG's will be higher...and then next time when you do, your MPG's will be lower.

To a lesser extent, what certainty do you have that the fuel you pump is the same temperature each time you fill up? Fuel, like any liquid, expands as it warms and contracts as it cools. Warm fuel won't have as much energy/gallon as colder fuel...so while you may pump the same number of gallons, you'll see variation in what that fuel will do for you. If you happen to be using a pump that compensates for the temperature of the fuel (unlikely, but possible), then that gallon of fuel you pump could actually be more or less than a gallon...because you are pumping the volume of fuel at the current temperature that equals a gallon of fuel at 60 degrees.

There are many other variables that go into fuel mileage...terrain...loads...etc...so any single tank isn't really a good indicator. Over several tanks, though, you start to see an average...because each independent variable begins to play a lesser and lesser role in the equation. Rather than calculating 1 tank full at a time, you are calculating the number of gallons purchased over several tanks vs. the miles run over several tanks.

 

88 + 93.3 + 140 + 50 = 371.3...not 283

Mileage adds up to 2297

2297 miles / 371.3 gallons = 6.18 mpg

 

84.9 + 144.9 + 121.5 + 114 = 465.3....not 380

Mileage is correct at 2769

2769 / 465.3 = 5.95 mpg

 

your math is totally off, your gallons on the bottom line dont match what you put in.

you are doing a tank by tank avg, then when you do the weekly total , you leave off a fillup, the math is fuzzy , you cant have avg of less than 8 by the tankful and then have a weekly avg of over 8. reanalyze how you did this