That concept sounds great, in theory. In practice it makes no sense: historically cars, engines, etc were developed at the Industrial Age/Revolution, which happened around the turn of the century. Megatron was only retrieved and taken to Hoover Dam in the 1930s. I think it might have been an exaggeration by Simmons, the perennial prima donna. And given that the only real thing gleaned from Megatron was the railgun seen in ROTF, I think that perhaps military tech like lasers were devised from Megatron.