Here's how it works.
1) You take the current mileage on your vehicle and divide it by how many miles you get to the tank. You then take that number and multiply it by the current cost of gasoline.

2)Next you take the current mileage from your vehicle and divide it by how many miles you got by the tank in your previous car. Then you take that number and multiply it by the current cost of gasoline.

So you take your bottom number and subtract it from the top number and see how much you saved by buying this car!

I'll go first and we will see who saved the most money!

06 Scion XA with 6k miles now. I get approximately 280 miles to the tank.
So that is 15000/280 = 53
Then It costs me $30 per tank, so that is 30 * 53 = 1590

My old car was a 2001 cobra mustang. So if I drove 6,000 miles I would have gotten only 200 miles to the tank on premium gasoline. So it's 15000/200 = 75
Now it would cost me about $50 dollars a tank for the cobra. So that is 50* 75 = 3750

So that means over the brief time I have owned the car I have saved about $2,160 on gasoline alone. WOW.

 

That's too much work.

I'll say that the 95 Camry I drove before I got my box got between 16 and 17MPG. In the box, I generally see between 25-30... I don't need math to tell me that I've improved.

 

Idk but going from a 13mpg ford bronco to a 30s mpg xA I can just assume ive saved a pretty penny.