FlexFuel E85, and what does it mean for me?

Alright guys, just got this Tundra so be easy on me… My last Tundra was just a 5.7, and my current one says E85 FlexFuel 5.7. What does that mean for me? Do I HAVE to use a specific type of fuel? What would happen if I didn’t? I feel like I’m probably overthinking it, but just wanna check. Explain it like you’re talking to a kindergartener, cause you basically are… Not sure if it matters, but it’s a 2017.

 

It means you can use E85 if you want because the fuel system was designed for the increased ethanol percentage. Regular E0 and E10 pump gas is also just fine, and preferable.

If you happen to use E85, your fuel mileage will be worse, and Toyota requires more frequent oil changes. See owners manual. Or better yet, just avoid using E85.

 

What he said.

I have the same engine as you but I've never run E85. Just pretend you still have your last engine and you'll be fine

 

It means that when your truck start cranking and not starting, you'll need a new fuel pump. This happened to mine at 75k miles and I never use E85 fuel. Luckily this TSB might apply for you as it did for me. Besides that, enjoy your new truck!

 

Did this happen slowly over a few weeks, or just all at once one morning?

 

It's just a 2 speed fuel pump, oversize injectors, corrosion-resistant lines, etc

Mine has never given me trouble (yet) and I run e85 a lot through the summer. It has more pep and cleans out enough carbon to cure pinging for a while. The extra oil changes are a nuisance sometimes. Less mpg but similar cost per mile. The dash says 10.6 mpg today for example but the fuel is 2.70/gal, about 25.5c per mile. Regular fuel is 3.70/gal so if I were burning that at 14.5 mpg the cost would be the same sans the extra oil change.

Just pay attention to the alcohol learn procedure in the manual if you do switch fuels. There's no sensor and it has to calculate it so no joyriding the first 5-7 miles after a fillup. If you always burn gas, nothing to worry about

 

Happened slowly for me, probably 1 month before I had it completely resolved. At first, I thought it was a battery issue. New battery didn't resolve. Took to mechanic and he couldn't replicate, but was able to pull codes related to fuel pump. I can't remember which thread it was, but somewhere on this forum, I found info about TSB. I had to prove to Toyota service department that my VIN matched the TSB and that the P codes matched as well. Afterwards they put me in a loaner Taco and replaced the FP at no cost to me.