Zompoc Survival

How fast do you think I would have to run to survive in the Zompoc?

I've been researching and there are many differing schools of thought on this subject. Some say that it depends on the zombies, either post death, were they fat slobs in their human lives, or post zombie state, have they been eating regularly and has it been lean human meat?

Another opinion holds that zombies would be faster in time, they would evolve within a month or two of being undead and at that point we're fucked.

Some think that they are the average speed of humans, but nowhere on the web seems to be willing to tell me what the average speed of humans is. However, if this is the case, I think I would prefer to be bitten in the obese land of America than anywhere else.

My personal opinion: faster than your slowest friend.

Finally, some think we would be faced with a dawn of the dead situation in which zombies are exceptionally slow and get their strength from sheer numbers.

Also, would it be better to work on sprinting or endurance or both? I can imagine a situation where both would be necessary.

I would appreciate input. I will continue to research, and I will be sure to share my results because my survival would mean nothing without weird floor.

P.S. I think we're all fucked in the event of a Velociraptor attack, so if there happens to be one, it has been nice knowing all of you.