When I had a Tacoma with the 3.5L V6, a pedal commander made a world of difference. The accelerator response lags so much, it absolutely ruins the driving experience and the result is an upshifting truck that does it too early -- that split second of lag doesn't let you hold the gear you're in even when normal driving dictates it. It changed that very issue, giving a more instantaneous response to your foot inputs on the pedal, and you have better control of your engine operating RPM range which needs to be 2000-3500 for the 3.5L -- but it wants you in 1000-2000rpm for it's fuel savings.