Shuck corn and set aside.
Heat grill to 350-400F degrees over medium-high heat.
Lightly bush corn with oil and place on grill, let cook for about 25-30 minutes turning every so often to brown each side evenly.
While corn is cooking, make the sauce.
In a small bowl whisk together the mayo and chipotle powder and set aside.
Remove cooked corn from grill and brush sauce onto hot corn, turning to get all the sides.
Optional: squeeze fresh lime juice or sprinkle Mexican cheese and cilantro on and server.