2 years later the cans of petrol are 0.02 STARPRO, which at todays exchange rate is 21632 STARBITS!

As a FTP user, and considering I just unlocked the 3rd zone, "Country Tour", I need a lot of these cans. I think I just hit my end game and need to quit. There is no way I can get that many starbits to progress further without paying real $$$. Is there another way?