8 1/4 gear question

Isn't funny how like when the national speed limits were lowered to 55 mph the gear ratios in new cars back then went down as well. Yeah I know to help boost mpg...why we had 55 mph speed limits. To save oil so now in 2010 we can dump millions of barrels of oil in to the sea, lol.


But common sense would say if you go slower on the freeways, you can run steeper gears in back.