Quote:
Originally Posted by Blacktree
Generally speaking, aero trumps weight, when it comes to mpg. I'm sure there are some extreme cases where this isn't true... but those are extremes. So for example, steel wheels with smooth wheel covers are going to get better mpg than lightweight alloys that aren't aerodynamic.
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A few months ago, while taking the dog for a walk and stopping at a gas station to get a coffee, I had a talk with a lady who was considering to not keep the wheelcovers of her 3rd-gen Prius after having a flat tire changed. Ultimately she figured out it would be better to keep the wheelcovers for aerodynamics sake.