Ben McIntosh struck three times and set up five more for the Rush (11-5), while Robert Church added a goal and six assists. Matthew Dinsdale chipped in with a goal and two assists to round out the attack.
Adam Jones led the Mammoth (9-8) with seven goals and an assist. Jeremy Noble had a goal and five assists, Drew Westervelt, Dan Ball, Mike Burke and Joey Cupido added the others.
Edmonton's Aaron Bold stopped 34-of-46 shots for the win. Colorado's Dillon Ward allowed nine goals on 38 shots in 32:47 of action while teammate Alex Buque stopped 15-of-19 shots in 27:13.
The Rush went 1 for 3 on the power play while the Mammoth scored twice on four chances with the man advantage.