What planet are you living on ? My average miles per gallon that particular trip was 27.8 miles per gallon. There are no exceptions or variables for that particular trip. That is how it works. Based on your philosophy. People can’t estimate fuel mileage accurately until a vehicle has 200k miles and is being crushed. I simply stated that I traveled 156 miles and that miles per gallon is a very good indication what the fuel mileage is for my car. Would other trips consume better or worst average miles per gallon ? Absolutely, more or less by a few miles per gallon