What are some reliable ways to test for fuel efficiency in a Nissan Juke?

I recently purchased a Nissan Juke and I want to make sure I'm getting the best fuel efficiency out of it. Are there any specific tests or techniques I can use to check for fuel efficiency?

One way to test for fuel efficiency is to keep track of your gas mileage over a period of time. Keep a log of the distance you travel and the amount of gas you fill up with. This will give you an idea of how many miles you're getting per gallon.