How to calculate how many you can earn with a car

[[CSR] Wouter]

Hello,

I want to calculate the difference with the income by driving between LX4 and XFG.
But i don't know how to do it.

I'm thinking about this now:

Average speed (m/s) = Average speed (km/h) / 3,6
Distance to income = Average speed (m/s) * Earning interval (5 seconds)
Average distance per coin = Distance to income / Coins (with XFG you earn 4 coins, when your speed is good)
Coins per kilometer = Kilometer (1000 meter) / Average distance per coin
Total earned with car = Coins per kilometer * Lifespan car (in KM, 30.000 for XFG)

Is this the good way? I don't think so, but maybe it is.

Regards, CruiseLover (i-love-cruise