Where are the revs? (And a question about fuel economy)

Hello,
I recently played the updated version of Automation and I made an engine which, in previous versions of the game, would not have failed due to the max RPM being too high. In fact, in order to rev (with an 86mm stroke) to 8500RPM, the engine required a billet crankshaft, titanium connecting rods, and lightwieght forged pistons. Even after this I still recieved a message telling me that my engine was losing lifespan due to the max RPM being too high. This is not similar to enignes of this day, such as the Honda K20 or Toyota 3S-GE, which achieve the same feats of engine speed without such high end components. Is there going to be plans for the return of the no-fail engine parts of the previous versons of the game?
Also, I am having difficulty getting my fuel economy under 400, a mark that was easy to beat in the older versions of the game. Were the old numbers overly optimistic?
I recently played the updated version of Automation and I made an engine which, in previous versions of the game, would not have failed due to the max RPM being too high. In fact, in order to rev (with an 86mm stroke) to 8500RPM, the engine required a billet crankshaft, titanium connecting rods, and lightwieght forged pistons. Even after this I still recieved a message telling me that my engine was losing lifespan due to the max RPM being too high. This is not similar to enignes of this day, such as the Honda K20 or Toyota 3S-GE, which achieve the same feats of engine speed without such high end components. Is there going to be plans for the return of the no-fail engine parts of the previous versons of the game?
Also, I am having difficulty getting my fuel economy under 400, a mark that was easy to beat in the older versions of the game. Were the old numbers overly optimistic?