What grade gas do you run?

[horsemnjoe]

in high altitude i use the lowest octane. with that i only buy 100% gas no ethanol. i get 20 to 22 mpg. if i have to use ethanol. my mpg is greatly reduced. I have a 2008 6m. Its very consistant with the right fuel. any fillers and the mileage drops quite a bit for me.

[Hemi71cuda]

I bought my FJ in New Jersey and drove it home to Ohio, so I conducted Octane experiments on the drive home. The dealer filled it up with Premium for me(not sure if it was 91 or 93), so after 200 miles(guage around half a tank) I filled up with 87 in hopes of then having a tank full of midgrade(hopefully around 89). Here are the results:

Premium: 21.9mpg
Midgrade: 21.6mpg

The FJ's engine is stock, with the exception of the TRD exhaust. It has the OEM roofrack, and aftermarket brush guard. It is AT and 4x4, I was using the cruise control at 68 as much as possible and I had the A/C on. Pure highway miles obviously...

[mikey]

Hemi71cuda previously said:

I bought my FJ in New Jersey and drove it home to Ohio, so I conducted Octane experiments on the drive home. The dealer filled it up with Premium for me(not sure if it was 91 or 93), so after 200 miles(guage around half a tank) I filled up with 87 in hopes of then having a tank full of midgrade(hopefully around 89). Here are the results:

Premium: 21.9mpg
Midgrade: 21.6mpg

The FJ's engine is stock, with the exception of the TRD exhaust. It has the OEM roofrack, and aftermarket brush guard. It is AT and 4x4, I was using the cruise control at 68 as much as possible and I had the A/C on. Pure highway miles obviously...

To see a real difference you are going to have to run a min of 10 tanks of each in a row. This will allow the ECU time to adjust maps and curves to optimize the power potential of each grade of fuel.

[Deangpc]

What difference will it do, if i run 91 octane one tank then the next 87? .. or 91 then 89. etc

[Jeff P]

I run the cheapest I can find (Costco , Amoco,Hess) I have no issues . I had a 03 Tacoma with 83k miles and all I did was 1 battery and oil changes still runs strong

[JOCKTHEGLIDE]

meh in Az we get only 91, but if I can get 93 I would.

[ozman]

My wife put in 89 for the first tank. The second tank, I bought 91. I didn't notice any difference in the driveability or mileage. So, I just use the cheap stuff. Besides, I don't really trust the gas stations. I picture one huge tank underground that feeds all the pumps, like in a cartoon or something.

[fjqc]

mikey previously said:

To see a real difference you are going to have to run a min of 10 tanks of each in a row. This will allow the ECU time to adjust maps and curves to optimize the power potential of each grade of fuel.

You're right Mikey...... at the fourth tank of premium in a row, i feel a real difference....... more horsepower under the gas pedal..... and more miles per galon too