Does this really do anything for my mpg's?...
Does this really do anything for my mpg's? And where does thule take their dimension measurements from? Will a 74" box fit 185 cm skis or would I need to move up a couple inches?
Thanks for the question. When it comes to your vehicle's MPG when the Thule Sonic Cargo Box is added, it's more of minimizing how much loss there is in MPG due to wind resistance and it is minimal nowadays with the newer aerodynamic designs of cargo boxes. Also, the dimension measurements shown are external, so the internal dimensions for the Large is more like 64" where your 185cm skis will not fit. Your skis will fit in the XL though as the internal length on that size is 81".
go here for more size info... http://www.thule.com/en-us/us/products/cargo-carriers/boxes