Why don't they make cars more fuel efficient by adding more gears to the transmission?

  • Thread starter Thread starter Louis L
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Louis L

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Wouldn't be nice to have a manual transmission car with 7 gears so that at 70 mph, in seventh gear, my rpm is barely 2000? Wouldn't such a car be more fuel efficient that a regular 5 speed manual? Why don't they make them?
 
yes, spacing gear better will help.
But if the ratio is too high, the engine will need to put out more torque not operate efficiently.
There should probably be one more gear for faster highway speeds on level roads.
70mph and 2k is a little unrealistic for an average sized car with an average sized motor.
 
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