You can expect dealer windshield replacements to cost more and take longer, while Safelite replacements are cheaper but might not have great quality assurance.
A small 2.0-liter Volvo engine is at the heart of this bonkers BMW E30, and it's not even the wildest build we've seen at the Norwegian hill climb event.
If you want to be as efficient as you possibly can be, build yourself a nice aerodynamic recumbent velomobile with a small e-bike assist motor this summer.