Manufacturer fuel recommendations

[Tweak]

Tweak: You are quite welcome. If there is anything else you need, please let us know.

Are you affiliated with FIAT North America or what? I see your sig Chrysler LLC, are you on other forums offering support and such?

[FiatCares]

Are you affiliated with FIAT North America or what? I see your sig Chrysler LLC, are you on other forums offering support and such?

I am a referral specialist for Chrysler that handles customer assistance and retention as well as dealer relations. Since the merger of Fiat /Chrysler, I also have been providing support for Fiat social media forums.

[Tweak]

I am a referral specialist for Chrysler that handles customer assistance and retention as well as dealer relations. Since the merger of Fiat /Chrysler, I also have been providing support for Fiat social media forums.

Good deal, want to get someone fired for me (kidding...sort of)? Guy at my studio is about the most worthless employee I think I have ever seen, hasn't once ever followed through with a single thing he has stated he will do, cool car the 500 but I'd NEVER send people to that dealer and am not 100% sold on the Dodge dealer next door but I only visited them once so far so I won't make any decisions on them just yet.

[FiatCares]

Good deal, want to get someone fired for me (kidding...sort of)? Guy at my studio is about the most worthless employee I think I have ever seen, hasn't once ever followed through with a single thing he has stated he will do, cool car the 500 but I'd NEVER send people to that dealer and am not 100% sold on the Dodge dealer next door but I only visited them once so far so I won't make any decisions on them just yet.

Tweak:

Sorry to hear of such an unfavorable sales experience... these vehicles are new to all of us but that's no excuse to take your money and then wash his hands of the transaction and relationship you are supposed to build with a customer... what has he promised you?? Is there anything that I can do?

[SniperX]

10.8:1 CR? No way I'm using 87.

[Tweak]

Tweak: Sorry to hear of such an unfavorable sales experience... these vehicles are new to all of us but that's no excuse to take your money and then wash his hands of the transaction and relationship you are supposed to build with a customer... what has he promised you?? Is there anything that I can do?

I eventually got it resolved but even since when I called and spoke with this guy he said he would call me back and speak with the other people there, when I got there no one knew I was going to be there and he hadn't ever called back which is common and expected so no shocker there. If I have issues in the future I'll get in touch, thanks.

[talindsay]

10.8:1 CR? No way I'm using 87.

Yup, that's exactly right. A carburetted engine at that compression ratio running 87 would have had a high-temp seize within 100 miles; these cars can use 87 only because they have enough electronics to retard the ignition timing and adjust the valve timing in the presence of fuel that can't handle the compression. But the ignition timing alone would mean dramatically higher emissions, and so I'm sure very little ignition timing is changed - which means they accept a certain level of knock (predetonation) and reduce performance primarily through the valves to keep it within margins.

That's all based on my general knowledge of engines, not based on specific knowledge of this car. But the manual actually states something along the lines of, "occasional knocking is acceptable", which indicates they're accepting degraded operation as within the margins so as to accommodate cheapos who refuse to buy the right fuel for the engine. That's a bad plan.

Personally, I'll stick to 91 and better.

[FiatCares]

Even though my vehicle is built to run on 87 (as most vehicles are) I still run at least 89... my car is worth it to me

[tec-9-7]

10.8:1 CR? No way I'm using 87.

Modern fuel injection, combustion chamber design, timing control, and the aluminum head make for a package that makes me OK with regular gas. I normally use Premium, however I would not sweat running a few tanks of regular.

[SniperX]

Yup, that's exactly right. A carburetted engine at that compression ratio running 87 would have had a high-temp seize within 100 miles; these cars can use 87 only because they have enough electronics to retard the ignition timing and adjust the valve timing in the presence of fuel that can't handle the compression. But the ignition timing alone would mean dramatically higher emissions, and so I'm sure very little ignition timing is changed - which means they accept a certain level of knock (predetonation) and reduce performance primarily through the valves to keep it within margins.


That's all based on my general knowledge of engines, not based on specific knowledge of this car. But the manual actually states something along the lines of, "occasional knocking is acceptable", which indicates they're accepting degraded operation as within the margins so as to accommodate cheapos who refuse to buy the right fuel for the engine. That's a bad plan.

Personally, I'll stick to 91 and better.

Even with the higher octanes you could get knocks because of additives or a lower MON rating in the fuel. It's sad but thats how they rate the fuel. Even if I can use 87, why? It's not like it cost much more per tank. I wonder if this topic will continue with the Abarth, lol.