In the short amount of time the M18 has been AH, I've heard all sorts of "way out in left field" tid-bits regarding said vehicle. This thread has a simple goal: to post the correct information about the M18 so players will **know** what is correct and what isnt. Please feel free to add/debate.
First, the main gun on the M18 is for all practical purposes is the exact same thing as on the M4/76mm. The AP and HE rounds are exactly the same. The AP round of the M18 will have the exact same AP capability as the M4/76 (134/115/97mm @ 0/1k/2k yards). The HE rounds are the weakest tank HE rounds in the game with 103 lbs of damage, meaning it will take 3 shots to take out a town building or other such OBJ). Reload rate is the same as well (5.5 seconds, est). The gun sight is the same, too. The only MG available is the pintle mounted .50 cal, no co-axial or hull mounted MG is available (not needed for TD duty,

).
Secondly, the M18 has no more armor than the M8 (13mm all around the hull and turret), save for the front of the turret which as 46mm of armor. Meaning, a single .50 cal MG from an M3 will be able to send the M18 packing if it gets close enough, and more importantly and probably likely to happen a lot is it will get sent back to the hanger by aircraft fire rather easily. Also, the open turret has quite obviously been proven an Achilles heel.
The speed of the M18 is 51mph, acceleration is better than what I thought it would be. Climbing hills is better than the T34, but remember the transmission is only a 3 speed so the gears are really strung out. The jury is still out on this one.
The size of the M18 is misleading, it can squeeze in between trees and turn a bit tighter than other tanks, it truly feels like an M8 when moving at 51mph.