I'll leave the real physics to darkwood as it's not my area of expertise, but on this specific point the answer must be negligible even if your theory is correct.Above test can be made in ELECTRIC VERSION 10 meter long wire 6h,6h,6h,6h you will see different resistance ! wire will change position respect to 30 km/s vectors. F... physics How much we can save money ( electric energy transport , water , gas ??? )
Think about all the other resistance factors involved, and even if what you're proposing turned out to have some merit you'd have to be several orders of magnitude away from anything that would have an sort of significant impact on the costs of transportation. Were this not the case, then the transport managers would have discovered this affect long ago, or at least since the advent of the complex fleet management GPS tracking and fuel consumption monitoring systems.
If you're an engineer, you seem to have forgotten the key engineering principle of sanity checking your work to ensure you've not made a fundamental error.
Frankly though, my money would be on you being completely wrong in your hypothesis, not that I can claim to fully understand what your hypothesis actually is, but I doubt that someone who's asking the question you asked in this post is likely to have got the more complex calculations right.
If what you are hypothesising is correct, I'd suspect it'd be of an order of magnitude that would only have any impact on something like communications in space, or maybe intercontinental communications or something like that.
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