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Stock Problems/IssuesDiscussions related to warranty related issues and repairs, or other problems with the OEM parts and software for MINI Cooper (R50), Cabrio (R52), and Cooper S (R53) MINIs.
Rolling diameter is the same and the weight won't necessarily be more so how/why would rim diameter reduce fuel economy?
I think you can safely scratch this as a possible cause...
Because rotational weight (Unsprung) is worth 3-4 times the same weight that's sprung. 18's that weigh (with tires) 75 lbs each vs 16's that weigh (with tires) 40 lbs each WILL affect gas milage. Not by 8-10 mpg, but you WILL notice a 2-3 MPG average hit.
02-19-2008, 10:28 AM
