Flex Fuel - Just For My Curiosity

I have a 2019 Non-flex fuel in AZ so it wouldn’t matter either way since we don’t have the fuel here anyways. To anyone who has a flex fuel Tundra and have used the stuff please appease my ignorance with a couple of questions.
1. Is there a noticeable power gain/lose when running it?
2. Do you change anything(flip a switch) when using it 100% or mixed with regular?
3. Is it cheaper then regular fuel?
Thanks much and again this is just from a BS session at work where we were talking about flex fuel and I was curious about our trucks.

 

I have a 2019 FFV. I don't normally use E-whatever gas, but during an 8000 mile cross country trip pulling a trailer this summer I had to run some because it was all the gas station had.

1.) Didn't really notice a power difference. Did seem like the MPG went down a little. Down to 7.5mpg instead of the 8mpg I got on other tanks.
2.) No switch I know of. Pump it in and drive.
3.) I don't remember it really being any cheaper. If it was, the worse MPG offset it.

 

Cost varies but is usually comparable to regular E10 the few times I've paid attention.

I've never used it because there isn't really any point to doing so in a naturally aspirated motor under normal availability and cost conditions.

Gas mileage in the Tundra will very likely decrease.

There is a sensor in the fuel system that detects the ethanol level and changes appropriate parameters automatically... no physical switch required.

Where it shines is in forced induction motors that have an aftermarket high octane tune that can really take advantage of it. In those applications you can make much more power than with 93. It is basically government subsided race gas.

 

They sell it in Central Texas and it is definitely cheaper. I have never used it or seen the point in it.

 

I owned a FF Tahoe and it was worse on E-85 than regular gas. No power difference either. E-85 has like disappeared from where I live because I never see it anymore. I think it was a get rich quit scam.

 

Its available around here, and if I had a big power turbo car, I would love it.
Some stock hypercars have a factory E85 tune that produces the advertised power number.

 

We have E85 in Oklahoma.
1: Noticeable power increase and a slightly different sound, but I don't have Factory exhaust either.
2: No switch to flip. Just add and go.
3: About $0.80/gal cheaper, but costs a couple mpg reduction. It pays for itself if JUST considering the fuel.
3.5: It also doubles your oil change requirement. Instead of every 5,000 miles you need to change oil every 2,500 miles because the ethanol can get past your piston rings into the oil.

I use a tank or 2 of E85 when I'm about 400 miles away from my scheduled oil change. I feel it cleans the injectors and valves, but I can't confirm that. It does clean the black soot out of your exhaust tips, which is a bonus.

 

Nobody uses that stuff anymore, it's always sold out.

 

Have used it in past in work vehicle - both E15 and E85

1. I found E85 to decrease mileage slightly, no power difference- but it’s a 4cyl so power was never there to start

2. no switches - it’s set up to run with whatever the approved fuel is - difference is just upgraded fuel lines aside from the sensors/electronic changes in engine

3. Price difference - yes, but it is subsidized by state - as much as 80 cents a gallon at one time - as little as 3 cents lately. At 80 cents a 10% drop in mileage is worth it still - at 3 cents absolutely not.

For the record they run Ethanol free in my Tundra - 93 pure cost same as 93 premium at local station - makes it a no brainer to me for a vehicle I drive maybe 3 times a week short distances. 38 gallon tank last more than a month and prefer no corn based products in a humid environment.

 

I run about 40gl through mine before an oil change.

Feels as though it has a little more torque, less MPG, engine sounds a little quieter.

I do it for the cleaning effect.

All subjective, but I'm ok with it.

Normally run 91 Chevron.

Truck lives above 5500' elevation