The 31-year-old rushed for only nine yards on his debut for the Browns in his side's win over the Minnesota Vikings, as he aimed to replace the departed Trent Richardson.
"Oh yeah, it's going to be a dramatic improvement," McGahee told The Plain Dealer. "Oh, we're going to have more than [nine] yards rushing. Don't worry about that.
"That's going to be an improvement. It's me getting familiar with the guys, learning how they do things, how they attack and handle certain situations, so I'm good."
The Browns face their AFC North rivals the Cincinnati Bengals on Sunday.