Question

You're bragging to your friend from Canada that your new hybrid car gets great gas mileage. You tell him you get 50 miles per gallon, and he says that's nothing: "I get 23 kilometers per liter in my new car". Does he actually get better gas mileage than you

Answer 1

(23 km/L) · (3.785 L/gallon) · (1 mile/1.609344 km) =

(23 · 3.785 · 1 / 1.609) · (km · Liter · mile) / (Liter · gallon · km) =

54.1 mile/gallon .

The Canadian's car is more fuel efficient than your car is.  

This should not surprise you.  The average cost of gasoline in Canada right now (October 2018) is a little over USD3.80 a gallon, compared to $2.60 in the US.