OK, so thankfully the chimichangas were all real — obviously — but what about the stunts in Deadpool? To perform such insane and death-defying tricks, you'd have to actually be superhuman, which means that most stunt performers do not have this capability. Therefore, it's absolutely necessary to use a little digital magic.
During the highway fight scene, digital stunt doubles were an absolute must. With crazy weapons and moves, it would be dangerous for a performer's safety. Therefore, computer cars and stunts were the best way to go.
While many people despise digital effects and enhancing, I think Deadpool made it work, as it didn't detract from the story and the mind-blowing action.
Just as long as they keep the chimichangas fresh and real. That's what really matters here.
[Source: Ian Failes at Atomic Fiction]