Some Questions about GTA ONLINE

[Terobero]

While i was doing a heist a hidden bar came out that said health 20/100. Actually i already discovered that peoples health are different because i died very easy like 2 police hits killed me and others died very hard. Why that bar is secret and is there a way to improve it fastly?

 

 

What is the best car in online? I don't mean fastest, i mean everything. I see most of the high level people use Armored Kuruma. I can afford it but im not sure that is the best. I only want to have 1 car so i want to waste all my money on that.

 

 

Last question; im doing the order heist thing, when i do everything in order i get 1 million. Is this quest can be done more than one time?

[WildBrick142]

-Every 20 ranks, you maximum amount of health increases, until it reaches 100% at Rank 100.

 

-Depends on what exactly are you looking for. There are many cars for many different people.

 

-Nope. You can only complete the Heist challenges once.

[Terobero]

-Every 20 ranks, you maximum amount of health increases, until it reaches 100% at Rank 100.

 

-Depends on what exactly are you looking for. There are many cars for many different people.

 

-Nope. You can only complete the Heist challenges once.

 

Where can I find a list of Heist Challanges?

[Crimie]

http://gta.wikia.com/wiki/Heists

Scroll down to the GTA Online section for a list of rewards and challenges.