Having 2 bikes on the back of the CX-5 really bites into fuel economy, even though the it's a hitch mounted tray rack. The bikes are tall enough that the 2nd bike juts out into the slipstream created by the vehicle. Driving 2hrs each way to the Whiteshell, I normally average about 7 - 7.5L/100km driving at approx. 108km/h. With one bike on, I get about 8L/100km. Yesterday, with 2 bikes on, I was getting closer to 10L/100km.