The Rangers boss has steered his team to 39 points from 13 matches and bookmakers are as short as 16/1 for them to win every league match this season.
However, McCoist is quick to admit he fears a stern test from Championship side Falkirk when the teams meet at the Falkirk Stadium in their fourth-round tie this Saturday.
Falkirk beat Cowdenbeath 4-0 last week and McCoist has warned his players to expect a step up in class against Gary Holt's men.
Speaking on Rangers TV he said: "I'm already reading comments after Falkirk's good victory at the weekend from one or two of their lads.
"They knocked us out of the League Cup a couple of seasons ago and are doing well in the league just now.
"They are looking forward to the Rangers game and they're looking to put one over on us again. You'd absolutely expect them to say that.
"If there was ever any doubt about how up for the game Falkirk are, you just have to look at their quotes in the newspapers. They're full of confidence.
"We've had them watched and they beat Livingston 4-1 recently, so it's a tough game for us this weekend.
"We're a massive scalp, of course we are, and I make no apologies for saying the vast majority of teams raise their performance levels against us.
"That's not a criticism of them, it's just a statement of fact and it's totally understandable that they do that."
Check out if Rangers can take their league form into the Scottish Cup live from Falkirk Stadium on Sky Sports 2 from midday on Saturday