If you are putting in 211mpg then the system would reject that as too great a disparity from the average 76.1mpg because you are obviously running it mostly on plug-in electricity and will also be benefiting from regeneration on the downhill stretches of the hilly terrain. Plug-in hybrid use is different from average use because a lot of it is on power station electricity rather than internal combustion engine, but our system has to have checks and balances based on the way most people run a car and 99.99% of cars are still internal combustion.