Here is what I'll give you advice.
If you are 2 vs 8 and considering running. DONT HIT one of them first. If you just run off they'll be alot less motivated to come after yall. However you kick one of them in the nuts... they are gonna be a bit more riled up and alot more willing to chase yall down and try and knock _your_ nuts out of yer mouth.
So just run off.
If you wanna fight them. I advise going apeshit, but before you say, apeshit? just go crazy? Well sort of yeah but theres a little more to it than that. I know most people talk about keeping focus and maintaining your cool. But the real truth is. You cant sit there and tell yourself to keep your cool and keep focused. It's just gotta all go together by blocking out alot of your normal rational thought. I think of it sort of as a battle fever. Just get yourself damn mean as hell, freaking mad dog fighting mean and freaking lay it out on them.
Getting mean is my "secret" to physical altercations.
If they got weapons and you can't or don't want to run get yourself some weapons. If they got guns though, unless you really have no problems dieing I'd run off. Its very unlikely that a bunch of jack asses are going to shoot you to death, they most likely want to scare you.
However if its a crack dealer who you [censored] off of some thugs who are cracked out and want to mug you, then yeah... they are the ones you gotta worry about really shooting you. The last time I ever dealt with a [censored] off crackdealer and his posse who had surround me and my friend I was luckily in my car and just hit the gas and aimed my car at him and hit the gas. He jumped out of the way without shooting at me and i sped off.
The real thing is. If you want to fight these guys you are going to go do it. If you don't want to fight them, and you really dont want to, then you don't need to come to a website like this for advice. Just use your head and stay away from any sort of place and out of any sort of situation where you are going to have to fight with them. They are probably just a bunch of dumb asses and aint going to mean [censored] to you in a month or two.