User blog comment:Visually/Gameloft has some insignificant rule for..../@comment-5000410-20150831111535/@comment-26536836-20150831121739

You mean win streak to get free C upgrade, right?

Yes, I know. In reality, (of course, except pro racer is easy for win streak, probably) 20 upgrades to save a million (or half million) credits that means 20 multiply by 9 win streaks. 180 games that you have to continuosly win.

And unfortunately, you can't expect all the win streak will give you the C upgrade. Because that randomness sometimes go crazy like keep give you the 1x Nitro Starter. That makes 200+ games. Possibly 250+ games continuosly win--I mean within 3rd place.

And if you are bump with triple booster, you will loose win streak easily. So sometimes, you have to do all over again.

Of course, you can level up cheaper one with credits and only expensive one to get free C upgrade.

But as you can see, it takes so much effort to do keep winning. And not many people can win all the time(of course, you can go with triple booster but that's painfully expensive especially extra tank.)