GX470 - premium fuel?? (1 Viewer)

[JLee]

Than you're not as observant as I am.

The only way to tell for sure will be to put the truck on a dyno with 93 and with 87 - I'd be curious if someone's able to find the one that was mentioned previously.

I run regular gas in my '07. If a dyno shows a performance improvement for 91/93, I would switch.

 

[efog]

The only way to tell for sure will be to put the truck on a dyno with 93 and with 87 - I'd be curious if someone's able to find the one that was mentioned previously.

I run regular gas in my '07. If a dyno shows a performance improvement for 91/93, I would switch.

I'm going to have to go with Madtoy on this. Long term adaptive will have a performance tendency to what the engine has normally ran with.

 

[stevezero]

I've only had three tanks worth of ownership. first was whatever the dealer put in it. Got 370 miles out of the tank hauling ass home from getting it. next tank was Costco 93 octane. fully loaded for a week at the beach. 410 miles out of the tank, running 65 to 70 on the highway. this tank I'm running 93 pure gas. can't give an accurate mileage reading, because we were flying to make a ferry.

Next tank going home will be 93 pure gas, and see how many.miles I can get out of it. that's gonna depend on how badly we want to get home. lol

 

[BlackCat]

I've only had three tanks worth of ownership. first was whatever the dealer put in it. Got 370 miles out of the tank hauling ass home from getting it. next tank was Costco 93 octane. fully loaded for a week at the beach. 410 miles out of the tank, running 65 to 70 on the highway. this tank I'm running 93 pure gas. can't give an accurate mileage reading, because we were flying to make a ferry.

Next tank going home will be 93 pure gas, and see how many.miles I can get out of it. that's gonna depend on how badly we want to get home. lol

Holy crap, I've never gotten more than 300 miles out of a tank. EVER. Even at high altitude.

 

[GXO]

I get 250-300 depending. But I am heavy!

 

[co4wheel]

I get 250-300 depending. But I am heavy!

You look good anyway.

 

[little_joe]

Attached is a condensed version of my log of every fillup since I got my GX. I do not doubt anyone's claims on mpg etc., but to me - actual data matters.

 

[Sleepy]

I usually run premium. I only fill up about once a month so the cost difference over a year is minimal. Does it make a difference, I don't know. I just know I didn't spend 6 months looking for my unicorn to get cheap on any fluids going in. I try to give nothing but the best for my Swank Tank.

 

[Bluetribal]

I just filled up with my second tank of 87oct since this thread started and have not noticed a difference in mileage from 91 and trying to pay attention to the timing and power ranges but nothing noticeable enough to mention. Will report back after 2nd tank and FYI I only use top tier gas brands.

 

[NMBruce]

Attached is a condensed version of my log of every fillup since I got my GX. I do not doubt anyone's claims on mpg etc., but to me - actual data matters.

I use Gas Buddy and have every fill up since I purchased the GX

 

[The Great Him]

I have run 87 in mine almost exclusively since the day bought it. A few random tanks of 91 and never noticed any difference other than the cost of fuel. The increased HP due to higher octane is a myth too BTW . The hotter you burn the more power you will make. The only reason for higher octane is predetonation... if you are getting that or "pinging" then use a higher octane fuel. Otherwise you get the most power from the lowest octane your motor will handle. The thing that auto manufacturers are trying to "sell" with the higher octane recommendation is emissions. Higher octane will net cleaner emissions theoretically. While I'm no engineer or scientist, that's how I understand this, and what I have heard from actual engineer's who have done the research and testing on this subject.

 

[jclarke450]

I have run 87 in mine almost exclusively since the day bought it. A few random tanks of 91 and never noticed any difference other than the cost of fuel. The increased HP due to higher octane is a myth too BTW . The hotter you burn the more power you will make. The only reason for higher octane is predetonation... if you are getting that or "pinging" then use a higher octane fuel. Otherwise you get the most power from the lowest octane your motor will handle. The thing that auto manufacturers are trying to "sell" with the higher octane recommendation is emissions. Higher octane will net cleaner emissions theoretically. While I'm no engineer or scientist, that's how I understand this, and what I have heard from actual engineer's who have done the research and testing on this subject.

As an engineer who has spent some time on this subject, I'll say that pretty much sums it up.

 

[madtoy]

I have run 87 in mine almost exclusively since the day bought it. A few random tanks of 91 and never noticed any difference other than the cost of fuel. The increased HP due to higher octane is a myth too BTW . The hotter you burn the more power you will make. The only reason for higher octane is predetonation... if you are getting that or "pinging" then use a higher octane fuel. Otherwise you get the most power from the lowest octane your motor will handle. The thing that auto manufacturers are trying to "sell" with the higher octane recommendation is emissions. Higher octane will net cleaner emissions theoretically. While I'm no engineer or scientist, that's how I understand this, and what I have heard from actual engineer's who have done the research and testing on this subject.

This would be true in a classic vehicle. But in modern, ECU controlled vehicles, it just isn't. The whole purpose of knock sensors, is to allow the ECU to adequately adjust timing. You may never hear the pinging, because the ECU instantly retards timing when the knock sensors detect detonation. If it consistently adjusts timing lower, it modifies your long term timing adaptives a lower, thus reducing or eliminating the detonation, as it learns the fuel you use. Switch to higher octane, and it will begin doing the opposite, and add timing back to the long term adaptives.

This takes more than one tank full either way, and you will most likely not even notice. The only way to possibly feel an immediate difference, is if you reset the adaptives between each tank (disconnect battery). Even then, it will take a bit to learn. It's an absolute fact that more timing equals more power. Higher octane allows more timing. So yes, higher octane provides more power. However, in my opinion, it's power that only John Force might be able to feel a difference with..

 

[The Great Him]

This would be true in a classic vehicle. But in modern, ECU controlled vehicles, it just isn't. The whole purpose of knock sensors, is to allow the ECU to adequately adjust timing. You may never hear the pinging, because the ECU instantly retards timing when the knock sensors detect detonation. If it consistently adjusts timing lower, it modifies your long term timing adaptives a lower, thus reducing or eliminating the detonation, as it learns the fuel you use. Switch to higher octane, and it will begin doing the opposite, and add timing back to the long term adaptives.

This takes more than one tank full either way, and you will most likely not even notice. The only way to possibly feel an immediate difference, is if you reset the adaptives between each tank (disconnect battery). Even then, it will take a bit to learn. It's an absolute fact that more timing equals more power. Higher octane allows more timing. So yes, higher octane provides more power. However, in my opinion, it's power that only John Force might be able to feel a difference with..

Yes but even modern ECU's only have so much advance and retardation they can adjust from, in fact distributorless ignitions have even less than older motors with distributors. Thus the ECU can only do so much. You will never get an octane low enough to cause issues here in the US maybe 87 on a super hot day in death valley but I doubt it.

The low total power from these motors from the factory even in the most ideal conditions really makes this argument mute, as we are talking less than 10hp here and I honestly don't even think John Force would feel that knowing the power he is used to...

 

[madtoy]

Yes but even modern ECU's only have so much advance and retardation they can adjust from, in fact distributorless ignitions have even less than older motors with distributors. Thus the ECU can only do so much. You will never get an octane low enough to cause issues here in the US maybe 87 on a super hot day in death valley but I doubt it.

The low total power from these motors from the factory even in the most ideal conditions really makes this argument mute, as we are talking less than 10hp here and I honestly don't even think John Force would feel that knowing the power he is used to...

I agree - it's not much, but it does indeed change HP ratings. Toyota has 2 different ratings on the 4.0 motor also, depending on the grade of fuel you use. At least they did on the 2nd gen Tacoma. Most mere mortals could never feel a 10 hp difference.

 

[NMBruce]

I was in the Chicago area for a week and never saw Prem for less than $0.60/gal more than reg and one place was $1.10 more at a Shell in Willowbrook area.

 

[wingysataday]

It seems like no matter what forum I go on, advrider, fz6, vw, scooters forums you name it, there are always people saying this or that improves the power or mileage. It cracks me up. without a dyno printout or a heavily controlled study your "feelings" of more power due to gas, intake, exhaust, etc mean nothing. You can't compare 1 gx to the next without taking into account a million variables, RPM's, terrain, tires, lift, weather, altitude, tire pressure, engine mods, engine history.... Kisses and hugs.

 

[04UZJ100]

It seems like no matter what forum I go on, advrider, fz6, vw, scooters forums you name it, there are always people saying this or that improves the power or mileage. It cracks me up. without a dyno printout or a heavily controlled study your "feelings" of more power due to gas, intake, exhaust, etc mean nothing. You can't compare 1 gx to the next without taking into account a million variables, RPM's, terrain, tires, lift, weather, altitude, tire pressure, engine mods, engine history.... Kisses and hugs.

What about engine smoothness?

 

[GXO]

Personally I think my kisses and hugs help my mileage most of all.

 

[madtoy]

Personally I think my kisses and hugs help my mileage most of all.

Can you post some pics of how you install this item?