Whatever you pay it will deduct from your balance mate, why would you set crazy limits like 10,000,000? you just need to pay 20,000 for normal
Transactions and 200,000 for ICO token transactions. if you pay more gas it will be deducted from your balance, I just don't know why they call it
Gas while it's the same Eth which will be paid to the miners. maybe some one with more knowledge could correct me if I'm wrong.
The most detailed about this concept is located here:
https://myetherwallet.groovehq.com/knowledge_base/topics/what-is-gasI was so confused on this concept while I'm doing ethereum transactions and after I read this source, It became very clear in my mind. Try to read from there. It will absolutely help you.