https://play.google.com/store/apps/details?id=com.hutchgames.cccg
It's a card based car racing game. It's statistics driven game. Over 700 different cars to play with and dozens of combinations for upgrades to these cards. I've been playing for roughly 45 days and have enjoyed it tremendously. It's F2P, but oh so easy to spend a crap load of money on. Give it a shot.
You can calculate the MRA with this Android app: https://play.google.com/store/apps/details?id=com.darksidestudios.mracalc
It is free.