Thanks very much mn photojournalist.
Driving time is closer to 3.5-4 hours as the entire trip is 4-lane or interstate highways. Depending on stops of course.
According to the NPS website, Las Vegas to South Rim GC is 278 miles!
Also Mapquest has it at 276 miles and Google maps has it at 278.
My Rand McNally Road atlas (old school maps) says 274 miles.
Hate to disagree, but us math teachers sure can do our figuring! LOL!
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