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There are exceptions to Costco's return policy, particularly with electronics. Be sure to confirm before making any decision.

This "Best" is in a 2020 5.3L Silverado dropping out of Tahoe into Sacramento, achieved upper 40s going into Sedona (Vortex?) but no pic. Not much of a point other than driving conditions have a huge impact on MPG. Gravity can be your best friend, or your worse enemy.

Been lurking for months, thought I'd make an account to share my experience with Lomax Pro. I LOVE it. Love the look on my 2020 Silverado 1500 LT (white/chrome). Easy installation. It is water tight and fits great. Does not fold up against window, but it does one better. When you need the...