Student or Learner
Myself Vishal and working as an engineer. In India, there are two commenly used terms
viz. "Average" & "Mileage" to express the "Distance the vehicle can travel per liter fuel consumption."
My question is as far as the terminology is concern in strict sense which is the correct term- Average or
Mileage. In India the word Average is quite commonplace compared to mileage. However according to my
perspective the word "Average" is quite wrong.
Will anybody elaborate?
As an NES but not a teacher, "mileage" in BrE tends to mean the "mileage between A and B".
That having been said, in your case, you could say something like "What's the [average/] mileage that you would get from your xyz car?" where, if omitted, the word "average" would be presumed.
I confess if someone said "What's your car's average?" I would not know what that meant.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.
In Thailand, although most people drive on the same side of the road as the UK, we work in kms and litres
My pickup's dashboard display reads 11.5 kms/litre (32.5 mpg) average over the whole time we've had it.
PS: Here "in the sticks" people regularly drive in the wrong direction on the hard shoulder/motorbike lane - even at night!