I am keeping record of my 2006 AWD Torrent mpg for last 3 years using "mileage" app in my android phone.
The average is 17.3 mpg.
The high record is about 25 mpg.
The low record is about 12.5 mpg.
In general if all my driving is within the city (I live in NYC) then it is about 15mpg.
Highway mileage usually in the range from 19 to 21 mpg. The high record was achieved when I drove full tank at cruise control set to 65mph on empty highway.
When my wife drives the car then mpg increases by 1-2.
Most of times I fill gasoline at: Shell, Mobil/Exxon and Costco gas stations. I always fill full tank and zero the trip odometer for the record.
The car has around 70k, new spark plugs and replaced air filter every 15k. Also I use chevron fuel injector cleaner at the time of oil change.