GX470 - premium fuel??

[stevezero]

Im guessin that is not somethin you would want to google search...

 

[mtwilly87]

I put off road diesel in mine, currently getting about 27-28mpg.

 

[wingysataday]

love it!!

 

[nikramos]

I filled up my 06 with 87 grade recently and noticed the GX is not as responsive compared to premium grade of fuel. I will never use Regular gas for this vehicle

 

[dogbite]

I have a 2004 gx and use 87 octane. I saw this debate and tried 93 octane for 2 tanks. Didn't see a difference.

Then found this long video to verify my finding.

 

[GXO]

I am getting 14.5 city on re gular after 4 tanks. Bam!

 

[The Great Him]

I only use 87, and then the other day this happened... look what 87 octane did to my GX

 

[NMBruce]

go back to where you got the gas and tell them what it did

 

[The Great Him]

I'm going to... I shoulda got 91

 

[NMBruce]

sorry it messed up your GX

 

[wingysataday]

ok now how about this. How do you calculate real mpg with lift and tires? I'm sure the stock mpg computer must be off right?

 

[little_joe]

ok now how about this. How do you calculate real mpg with lift and tires? I'm sure the stock mpg computer must be off right?

I use the stock tire size as a base, then multiply the odometer reading by whatever factor the larger tires are; then divide those actual miles by gallons.

For example: my current tires are 5.2% larger than stock, so if I drove 100 odometer miles, that's actually 105.2 miles. Then divide that by gallons pumped in to get actual mpg.

Needless to say, I do this in a spreadsheet to keep the running tab.............

 

[wingysataday]

could you just add 5.2% somehow to whatever the mpg reading on the gx computer says?

 

[little_joe]

No idea - I don't ever change the display from outside temp. I don't know that it is programmable.

 

[JLee]

I use the stock tire size as a base, then multiply the odometer reading by whatever factor the larger tires are; then divide those actual miles by gallons.

For example: my current tires are 5.2% larger than stock, so if I drove 100 odometer miles, that's actually 105.2 miles. Then divide that by gallons pumped in to get actual mpg.

Needless to say, I do this in a spreadsheet to keep the running tab.............

That's the way to do it.

 

[madtoy]

The computer never seems right. Just do the calculation of how many miles the computer thinks you went, divide by gallons to fill - then multiply by 1.052. See how close or far from the computer calculation it ends up being.

 

[GXO]

34"s are 12.4% larger if anyone needs the math lol

 

[ohio]

Just got me 07. Decided to try running regular especially because I was at altitude (~6000ft). Half a tank in the truck threw a CEL. Screens from my OBDII app attached showing a slight air leak. Is it possible that the computer interpreted either the octane or the altitude as that error? Cleared the codes, filled with premium and haven't had a CEL since. Also haven't tried regular again.

 

[GXO]

The altitude changes the pressure in your tank. Its your gas cap

 

[MGordo]

If Im not mistaken, the higher altitudes actually have the effect of increasing the octane level of your fuel...