I am just trying to place a quantifiable pricing differential towards the pricing between 5sp vs 6 sp on a guesstimate manner.
However on the emotional side, Simon has yet to own a 6sp car, so the head might point to 5sp, the heart will undoubtedly point to 6sp (regardless of the price differential).
Can the $50k to $60k difference (if this is the case) can justify the fuel economy (0.64L/100km or 2mpg)?
Babybenz 發表於 2011-8-8 23:08
Simon does 150km on a daily basis, assuming 90% of the daily trip is highway using top gear.
5sp final gearing ratio = 3.53
6sp final gearing ratio = 3.13
6sp has approx. 11.3% taller gearing than 5sp, and assuming 5sp is returning $1 per km, and further take a wild guess that the mechanical losses + extra gear weight of the 6sp gear box results in 1.3% losses, hence the net fuel saving is approx. 10%.
150km x 90% x $1 x 10% = $13.5 per day
Assuming 5 days a week, 52 weeks per year.
$13.5 x 5 x 52 = $3,510 p.a.
Further assuming a 6sp will have a $10K residual value over the 5sp model (of similar age), therefore you can consider a 6sp model with $20.5k premium over the 5sp model (base on fuel efficiency + residual value)
MRS (5 spd) MRS (6 spd)
Gear Ratio Overall Ratio Gear Ratio Overall Ratio
1 3.17 13.63 3.166 13.65
2 1.9 8.17 1.904 8.21
3 1.39 5.98 1.392 6.00
4 1.03 4.43 1.031 4.45
5 0.82 3.53 0.815 3.51
6 0.725 3.13
Final Drive = 4.3 Final Drive = 4.312
1st to 5th gear for both 5 spd (9.26L/100km) & 6 spd (8.62L/100km) models are almost identical. 6th gear is for OD and fuel economy only. So both models are the same in terms of performance and 6 spd model has better fuel economy. Also 6 spd will be heavier.
Can the $50k to $60k difference (if this is the case) can justify the fuel economy (0.64L/100km or 2mpg)?
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