The Interstate features Airstream's attention to engineering detail, including unibody chassis construction and a turbo-charged Mercedes diesel engine, giving it a fuel-efficient 22 mpg highway rating. It's streamlined and comfortable. Reliable. Easy to park and easy to drive. The Interstate is truly an all-purpose touring coach, just right for today's energetic lifestyles. It easily adapts to both weekend trips and extended travel. Wherever you go with an Interstate, there you are. It's simple.