Surprising discovery: 5-speed vs 6-speed automatic

The downside is that they are programmed to upshift and run in the highest gear at all times to maximize fuel economy. Anytime you hit a slight incline or need a smidge more power, you cause a downshift. Seems like the more gears you have the harder the trans works, the PCM is constantly shifting it, either up when you let off the gas, or down if you step on it even a little.