It doesn't take much throttle for the car to keep a steady speed on a flat hiway. Gear you have 5 gears and to make it have a lower rpm in 5th, you need to widen the gap from the lower gears. This does mean...longer 1st gear if you want, and longer 2-3-4 depending. Sometimes gearing is made just for the daily driver and it looks ugly to the performance driver.
The quick you get up to speed, the less you are on the throttle the rest of the way to your destination.