indeed most modern cars build in timing/fuel maps for lower octane fuel just in case....decrease in power and fuel economy result.I'd follow the owner's manual.
I'm almost positive the PCM will pull timing to avoid knock on lower octane, but that's probably not optimal..
Except in the SRT, which requires 91 or higher, per the owners manual. If it could run SAFELY on 87 or 89 they would have done something similar to the 5.7 where they say 89 preferred 87 acceptable.The PCM knows the difference in octane. So running 87 octane is no problem.
I bit harsh but I gotta agree. When you purchase a Performance vehicle you should absolutely use the correct fuel in it and not penny pinch. I know the SRT engine basically just drinks gas probably even when it's running LOL but don't void your warranty or cause any engine issues by using lower Octane fuel then what's recommended.Don't spend $70k on a car then penny pinch on a lower grade of gasoline.
It wouldn’t implode or melt anyways. Just pull timing if detonatingAs Mr Bill put a few thousand miles on his 392 and claims to have felt no difference in retrospect with 87 I'm glad to hear the engine did not implode or otherwise melt.