"If you're stuck in traffic and you see it bumper to bumper for a while and you have start-stop, don't turn that off," said David Bennett, AAA senior automotive manager. "Allow the engine to turn on and off as it's needed."
That's especially true for when drivers don't need to blast air conditioning while waiting for long periods of time.
Many drivers have roof racks on top of their vehicles or bike racks on the back. It takes extra fuel to push that structure through the air - experts have found it can cost several miles per gallon.
"If you're not actually using those devices, it's like dragging a parachute behind your car," Crossen said. "Any other type of accessories that basically cause drag, you want to lose those."
If you're carrying heavy items in your back seat, trunk or truck bed, and you don't need them, leave them at home.