They had nothing like that sort of a lead. Indeed, German planners were of the opinion that they had to start the war by 1941 at the latest, because by 1945, peacetime France and England would have caught up with them. (Cited in William Shirer’s Rise and Fall of the Third Reich.) Thus, even the German General Staff only put their advantage at about five years.
Germany probably used more horses than Britain and the US combined. Indeed, the USA did not have horse cavalry in any part of the European theater. We didn’t even have any significant amount of horse transport. Instead, we took the grand innovation of purely mechanized transport. The Germans had the Panzergruppe, but their supply and transport was still essentially First World War vintage–railroads and horse.
The Autobahn was a military failure for the Germans. This wasn’t because it was a bad design–it was an excellent design. It was because the German General Staff had all their plans centered on railroad transport.
The former rendered strategically impotent by intelligence, the latter never being anything more than a terrorist tactic.
Stukas were a joke over Britain. They were considered a form of target practice for British flak crews. As for the others, ever hear of the Spitfire and the Hurricane, which trashed the Jerries’ crates well and good?
And then the Thunderbolts and the Mustangs got into the act, and only the ME262 was greatly superior. But even then, Britain had put the Gloster Metor and the USA had the P-59A Airacomet in flight, if not in combat. British aircraft manufacturers had actually been flying jets since 1941 but they wanted to be sure that their frame was strong enough for combat under such stress.
As was everybody else. The big difference was that the Allies didn’t need to do that, since they had access to South American rubber North American petroleum. Why waste resources during wartime for a substitute that you don’t need?
Nazi scientists were divided up among the European theater allies as a spoil of war. But never forget that it was the Allies who got atomic weaponry, not the Germans. In part, it was due to sabotage by German scientists. In part, it was because Einsteinian physics was initially rejected as being “Semitic”. This set German efforts back in much the same way that Lysenkoism devastated Soviet agricultural and biological research for decades.
As for the Autobahn, the last TV show I saw on US cable regarding the American interstate system made it very plain that the German system was the inspiration.
I find it very interesting that you say the USA “stole their idea of the autobahn”. Why do you have so much hatred for the USA that you consider a legitimate copying of a good idea to be “theft”? After all, the Germans never claimed intellectual ownership of the concept of broad, straight highways.