It's been three years now and I still haven't seen the second option.  Is this ever going to happen?

Rufus,

I went through this with Adrian before, he just doesn't look at it the way we do.  His method isn't any more accurate, but he refuses to change or even give an option like you suggested.  I gave up trying to explain it to him.  

Allright, it's your app, do it the way you want to.  I see why you say your calculation is not so easy - because it is not realistic or rational.

Consider a situation that you fill up with 20 gallons, at $2.50 per gallon.  

Then you drive 400 miles, you stop and fill up with 75 gallons, at $3.00 per gallon.

By my method,  it cost you $225 to replace the fuel you used to drive 400 miles, so your cost per mile is $0.5625

By your method, the first 20 gallons you have used is at $2.50 per gallon, so the first 20 gallons equal $50, now what price do you use for the other 55 that you have used?  Do you look to the next previous fillup, or do you assume the same price?  

Like I said first, it's your app, make it the way you want it, but don't tell me I'm wrong about the way to calculate it.  Your method of calculating maybe useful to you, but it is completely useless to me.

I like everything else about the app, it works great and does what I need.  This is the only piece of data that is not meaningful or useful for me.

Thanks for the response!  Why is it not so easy?  To me, a cost per distance is very easy - it is simply the cost divided by distance traveled.  As I mentioned before, if I traveled 455 miles since the last fill-up, and it cost me $189.72 to fill, then my cost per distance between those fill-ups  is $189.72 / 455 = $0.417/mile, NOT 0.402

Maybe the cost per mile feature means something different to you?

Thanks again,

Rob