first of all, your top speeds are horribly incorrect, 2nd of all top speed is not acceleration. Not sure why you keep getting that conused. And why on earth would the mechanical advantage dissapear after 3rd gear? If anyone besides this tool wants evidence of shorter final drivrd improving acceleration, and you cant find it on google, let me know id be more than happy to link to the plethora of articles and tests proving quicker acceleration.
Herrs one quick reference, i think you are not fully understanding the purpose of a final drive
http://www.badasscars.com/index.cfm/...rod/prd398.htm