I just took a trip to Beaver Creek, CO for the Tough Mudder. I live in the Denver area and usually get ~ 14-15 mpg on this trip. Only difference this time is I had the 91v2 tube. I averaged 20 mpg! I wasn't necessarily driving with the intention of getting good fuel economy.
LMS is Livernois MotorSports. Some us run the tune from them, some run tunes from other companies. It's all preference. There are many different places you can get a good tune (our friend Bill with stage 3).