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Now let's talk about uphills and cruise control. We all know any kind of incline kills the gas mileage in the MDs. There are plenty of inclines in upstate NY and VT and I still got 40 MPG! Tip 3: Turn the cruise control off about 0.5 miles before any incline on the highway. If you leave the cruise control on during an incline, the car doesn't know how long the incline will last or how steep it is so it will shoot the RPMs way up (3200+) to maintain the cruising speed even if it's a slight incline. This equals a gas mileage killer. So to fix this, the driver knows how steep the incline is and how long it will last therefore the driver can control the RPM's and speed. Every time I encountered an incline, I would increase my speed only about 5 mph prior to the incline. This barely increases the RPMs and you make it up the incline. So what if you loose a couple MPH while going up the incline, you are still maintaining the best MPG possible. It is important to watch your RPMs here because you only want them to slightly increase, you do not want to JUMP UP to 3000+ rpms on an incline.