While the numbers might be true in theory they are wrong in practice. I frequently have my Tib up to about 120-135 on the interstate here on the way home from work, and it's only 4th gear at about 3500 RPMs (this is in an '03 GT V6 auto). I've also brought it up to over 150 (about 152) a couple of times when the weather was PERFECT (i.e. cold dense air) and my engine was just at the right temp (pulled it off exactly 3 time). Sometimes I can still get close to there but usually bottom out right around 145 and it simply WON'T accelerate more even though I'm only at about 5k RPMs). So while the numbers may work out good they are not necessarily true in practice.