LTC8K6
Lifer
- Mar 10, 2004
- 28,520
- 1,575
- 126
That is usually because the gear ratios on the Autos are taller than the Manuals.
For example the 2012 Mazda 3
Auto:
First Gear Ratio1): 3.55
Second Gear Ratio1): 2.02
Third Gear Ratio1): 1.45
Fourth Gear Ratio1): 1.00
Fifth Gear Ratio1): 0.70
Sixth Gear Ratio1): 0.59
Final Drive Axle Ratio1): 3.89
Manual:
First Gear Ratio1): 3.21
Second Gear Ratio1): 1.91
Third Gear Ratio1): 1.36
Fourth Gear Ratio1): 1.02
Fifth Gear Ratio1): 0.94
Sixth Gear Ratio1): 0.79
Reverse Ratio1): 3.45
Final Drive Axle Ratio1): 4.18/3.52
Sporty drivers get better acceleration from the manual with a slight hit to Fuel Economy, whereas normal drivers get the extra mpg. If you equip the manual with the exact same gear ratios as a conventional auto transmission you will be better fuel economy from the manual. Mechanical linkages are always superior in terms of efficiency.
Obviously dual clutch transmissions being mechanical in nature as well, are exempt from this logic.
The Autos can tolerate the higher ratios...the manuals generally cannot.
