14 mpg, new ECU flash, new radiator, 265/75/16

Does that make any damn sense? Lol 14? I was getting around 17 before they replaced the radiator and flashed it.

 

All i can tell you i was getting an average of 21.5 mpg with the stock 245/75 16 tires. When i installed heavier 265/70 16 tires my mpg now averages 22.5
Plus compared to my gen1 tundra the odo in the tacoma reads slightly more for a measured mile. When i go in for my first service, i'm going to bring it up.

 

No

 

Why the hell is it so low? Maybe gave me the “fuck this guy” tune? Makes zero fucking sense. Ima have to take this bitch back now. I have like 4 weeks and 2,500 miles of warranty left.

 

i get around 20 on the highway with the same tires 265 75 16. ECU flash might have more to do with it

 

Maybe give it some time to adjust and calculate it based on miles driven vs gallons filled

 

Assume your ecu is just having a wtf moment not much experience but unless your towing max weigh 14 mpg reading is not right.

 

There is no choice in TSB tunes. Software is software.

One thing that I personally found is DTC and Learned Value Resets really helped me. You need TechStream and a connection though. Nail the Reset and then let it idle for 5min while touching nothing.

The first drive will be a bit rough, but from there it will adapt mostly to you.

 

I’m getting double teamed. 2017 radiator fucked, no reason. Replaced, updated ECU, 14 mpg. I literally got to my odometer like 250 to a tank. Lol. I don’t drive far and I don’t drive fast, morning cops are dicks.

 

I feel for you.

A tune flash or the Resets will take time to settle in. About 400mi.

 

This. No way to know until you give the computer some time to forget about it’s subliminal Japanese engineering. China FTW!

 

What was wrong with your radiator?

 

Hope so! It was a 2017 with less than 33,000 miles radiator had “no physical damage” had a like 10 page thread on “where the fuck is my fluid going” I still dk what the fuck is going on. It’s like they filled it to my hashmark and it’s not there. Lol

 

Just a shot in the dark, I’d guess the long term fuel trims all reset with the reflash. Give it a couple tankfulls.

 

Solid, thought the same... but limited time on bumper to
Bumper.

 

How do you flash the ECU or reset it in a 2020? I need to get my mpg's and odometer reading correctly after installing larger tires.

 

There nothing that can be done there. The Hypertech SpeedoHealer does not work on 2019s or 2020s. TechStream is no help either.

 

big oof