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My '07 mustang V8 can pull from *below* idle in fifth gear. I really don't need a fifth gear that works all the way down to ~20 mph. I would rather get more mileage. Right now first gear is short enough that I start from a stop 99% of the time in 2nd gear.
In the mustangs case as a drag racing vehicle, people at the drag strip (stock) run through third gear, and those that modify change the final drive to match the top of fourth to the speeds they are running. Fifth is still available to be a fuel economy gear.
In my case, the trans has a variant with a different fifth gear, (.62 vs my .675 ratio), and I have the optional 3.55 final drive versus the 3.31 base. I could also go aftermarket to a 3.27, 3.08, 2.73, or 2.41 if I could find them.
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