Not built for speed, but the differences between them are significant. I don't really classify my latest 80 as slow. It's not a 300Z but considering it's weight, it's not slow either. I care.I think we are all overthinking it....these trucks are not build for speed, so who freaking care if one is slightly faster than the other. On paper, they are all SLOW! I was recently in Thailand and Cambodia, 100 series there are like Toyota Prius here, they are everywhere, and so are 200 series and 80 series....point being is, these trucks are made majority for the 2nd and 3rd world country where they mostly see dirt and unpaved roads and hardly ever get over 60mph..