Does Cruise Control Save Fuel in an RV?

Meta Description: We test and explain exactly when cruise control helps and when it hurts fuel economy. Does Cruise Control Save Fuel in an RV?

Cruise control is a fantastic driver-assist tool that reduces fatigue on long journeys. But when it comes to fuel efficiency, its effectiveness depends entirely on the terrain and your driving style.

The Advantages on Flat Terrain

On long stretches of flat, even highway, cruise control is your best friend. It maintains a perfectly steady speed, eliminating the micro-fluctuations in acceleration that human drivers naturally make. This steady pacing maximizes your RV's fuel efficiency.

The Disadvantages in the Hills

Cruise control is reactive, not proactive. When you hit an incline, cruise control realizes the vehicle is slowing down and responds by giving it full throttle—often causing an aggressive downshift to maintain the exact set speed. This rapid acceleration burns a massive amount of fuel.

The "Smart" Way to Drive Slopes

Instead of relying on cruise control on hilly terrain, use your momentum. Let your RV naturally gain a little speed (safely) on the downhill, and allow the speed to bleed off slightly as you climb the next hill. Steady pedal pressure, rather than steady speed, is the key to fuel economy in the mountains.

Adaptive Cruise Control Considerations

If your rig has adaptive cruise control, be mindful in heavy traffic. The continuous braking and accelerating to match the vehicle ahead can negatively impact MPG. In stop-and-go situations, manual control is better for your wallet.

The Verdict

Use cruise control diligently on flat interstates to prevent "speed creep" and maintain an efficient pace. But as soon as the terrain starts rolling, turn it off and take manual control of your momentum.