18 vs. 20 inch rims on a 2011 Silverado truck?

Baja_Sessions

New member
I am looking to buy a truck and am having to decide between 18 and 20 inch rims. The regular rim size for the base model is 17 inches, so either 18 or 20 is an upgrade. I just need to know what are the benefits/downfalls of each (i.e. gas mileage, smooter ride, etc.)? Any recommendations would be great. Thanks
 
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