[jyl]

There's obviously more controls to the CU procedure than are described in the single summary paragraph. I think you can assume the testing is designed by engineers who thought of everything you have thought of and more. Is it as repeatable as dyno testing - surely not. However, you don't test airplanes on a dyno, and yet manage to get reasonably valid data.

The thing with the EPA testing is that the auto companies know the procedure in considerable detail. So they could, hypothetically, design to the test. In this day and age, program software to the test. Do they . . .