throw a 54 on the road bike, you’re almost there anyways!!!
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Probably should 
I think it all depends on how fast you are going. What’s your average speed? What’s your minimum and maximum on a typical course?
This chart has some info and, although the article says 2X is always more efficient than 1X drivetrains, I think the take-home is larger rings and a straight chainline is more efficient.