The ECU isn't intentionally degrading performance, it's balancing the air to fuel to compression ratios for optimal combustion of fuels and reduced emissions.

The ECU isn't intentionally degrading performance, it's balancing the air to fuel to compression ratios for optimal combustion of fuels and reduced emissions. It's a dynamic systems and degradation in performance occurs as a result. It's not intentionally handicapping the performance to hide the fact that your fuel tank can no longer hold the same volume of fuel.