I have 400 miles on my ‘19 STX, and with the 5.0 I’m supposedly a Flex Fuel Vehicle. It’s listed on the window sticker, and it’s on the fuel filler port, but I don’t have a tailgate badge.

Anyway, with the insane price of gas here in CA, the E85 is starting to look like a viable alternative. Pump price is $2.89 vs 87 octane at $3.89+.

Has anyone used E85 this early in the life of the vehicle? Are there any issues with breaking in the engine? How long is that break-in period anyway?

Any help or advice would be greatly appreciated.

 

This is a great question and one I'll be looking at when my 2020 arrives.

PS: think gas is expensive in CA? Try here in BC where a US gallon of 87 octane gas costs $5.48 Canadian (still $4.14 US.)

 

Break-In is described in the owner's manual. It is 1600km of not trailer towing/heavy loads etc. E85 would have no impact on break-in at all. Why would you? It is just putting higher octane fuel in.

 

What is this "manual" you speak of?

 

If it was $1.02/gal cheaper here in Vegas to put in E-85 I would have been putting it in since day one. If the engine is designed to run on it, then use it.