I was going to write something longer and then got distracted and this thread went bonkers, so sadly your post is not going to get the attention it deserves. I

I was going to write something longer and then got distracted and this thread went bonkers, so sadly your post is not going to get the attention it deserves. I've actually toured a fuel economy lab for a Tier I/Big 3 auto manufacturer. The testing procedures described there are correct...account for as many variables as possible. The lab I toured had the dynos in temperature and humidity controlled rooms. Exhaust vents were standardized in length to ensure consistency, etc. MPG is serious business with millions on the line. Most interesting story I had was that they have several drivers they use for different purposes. Some are super consistent and used for repeatability tests. Others specialize in maximizing mileage. They quoted a 5% improvement by certain drivers over others on the SAME TEST. which already has incredibly precise time/speed windows that the drivers must stay in between. Every time, someone is manually controlling the throttle and brake pedal. Although they can use a computerized control for other testing. They will run the test until they get the best possible test and then ship that to the EPA.