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Ovekam, I couldn't resist to calculate this:
125i, total reduction in 3rd = 5,1221
125d has 4,746
both have a wheel travel of exactly 2 meters per 360degree turn.
so 20mph= 8,9m/s and 60mph=26,67m/s
or 20mph= 534m/min and 60mph = 1600m/min
Consequently,
with this wheel, you need an axle rotation of 267rpm to attain 20mph and 800rpm to attain 60mph for both cars.
125i revolves between: 1367 and 4098 rpm
125d revolves between: 1267 and 3797 rpm
but torque is multiplied with 5,1221 and 4.746 respectively.
So to short cut... the 125d wins hands down. And I guess that it is this experience that prevails.
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