I noticed this as well. I thought there was something wrong with the throttle cable. Tried lubricating it with no effect. Looked at the throttle pedal and noticed a couple of springs behind the pedal. I wondered if replacing them with weaker springs would have helped, or even removing one entirely. But in the end, decided to just live with the stiff throttle pedal. I just chalked this up to part of the car's "personality."