[72grande]

If you want to start talking about power bands, then peak power mean's ****. What then matters is average power over the RPM's that you have to drive in, the RPM's that you have to drive in is determinded by gearing. But were gettin off topic.

Its just phisics, F=MA. If M stays the same, and A increase's, F has to increase. More F, same M, there has to be more A. More A, same M, there has to be more F. No fighting it.
A can be measured by either the speedo or the tach. It can be measured by the tach because the ratio's dont change. So if the tach climes faster, the speedo climes faster. If the spedo is climing faster, the car is acelerating faster. More A, same M, more F. The only way to make the tach clime faster without changing the wieght, is to have more F.

In as few words as possible -

"Reving faster means acelerating faster. It takes more power to acelerate faster."