There have been a lot of technological advancements, and breakthroughs in efficiency to make modern cars, trucks, and SUVs so much more fuel-efficient than their counterparts. While engine design certainly plays a huge role, automatic transmissions have come a long way as well, contributing greatly to the gas mileage of your vehicle. From Reeves Automotive in Decatur, TX, here are some ways transmissions have changed to meet the demands of fuel efficiency.