Premium Gas?

[Mark-5.7]

Anyone try higher octane 91 or 93 to see if there is better performance? Just wondered if the stock computer would advance the timing with higher octane. I read where some vehicles can adjust there timing tables with diff. octane gas.

[djb383]

Google 'octane myths' and you'll get your answer.

[WhiteFang]

I didn't notice any performance difference as it relates to speed, but when I went up a grade to plus the truck jumped in gas mileage. It was enough to convince me to run plus all the time.

[kng131]

what was the change in mpg?

[RunItHard]

Originally Posted by Mark-5.7

Anyone try higher octane 91 or 93 to see if there is better performance? Just wondered if the stock computer would advance the timing with higher octane. I read where some vehicles can adjust there timing tables with diff. octane gas.

Mark, I'm at 4,500 feet and run low octane (85 here in Utah). No need to run higher than that at higher altitudes. You're just wasting your money. I have no ping, even when running under load towing my TT up mountain roads.

If I were running at sea level I'd run the recommended 87 octane.

[TampaTundra]

Ive been doing premium most of the time, can get it for alot cheaper in the middle of the state when I am going from home to school and back, then when I am in the city usually middle.

[Mark-5.7]

Originally Posted by RunItHard

Mark, I'm at 4,500 feet and run low octane (85 here in Utah). No need to run higher than that at higher altitudes. You're just wasting your money. I have no ping, even when running under load towing my TT up mountain roads.

If I were running at sea level I'd run the recommended 87 octane.

Thanks, I've been running 87 in Denver but will go back to 85 & see if there is any performance diff. BTW, love the drop in. First thing I did was lay about 100 ft of rubber & sounds better too!

[Mickey]

What premium does for you is the same thing as STP fuel treatment. Use premium twice a year to clean your jets and everything else. Just the same with STP fuel treatment will do. It doesn't give you better gas mileage (myth). Mythbusters proved that.

[djb383]

.............and major brand 87 octane gasoline has the same detergents and amounts that 91/93 octane gasoline has.

[Tundrawwjd]

Originally Posted by Mickey

What premium does for you is the same thing as STP fuel treatment. Use premium twice a year to clean your jets and everything else. Just the same with STP fuel treatment will do. It doesn't give you better gas mileage (myth). Mythbusters proved that.

What kind of truck did they use...
Just wondering because couldn't it matter if the Technology in the New Tundras are ahead of Mythbusters...

[WhiteFang]

Well, I don't care what Mythbusters said, my mileage went up by almost 2 mpg when I went to the mid grade. The ONLY gas I run is Chevron - and using their regular grade I had NO ping and NO performance issues. As such, I didn't think that going up a grade would do anything. But the very best I could do was 15.3 mpg with mixed driving. I am now running Chevron plus and the mileage has jumped to the low 17's - and that's a consistant increase measured over three full tanks.

Heck, you can see the difference on the trip computer as you're driving. Hills that use to drop me down to 13 or 14 mpg now show a steady 16.

But don't take my word for it, just try it yourself. The cost difference for a full tank is right at $3 and it certainly can't hurt anything.

[RunItHard]

Originally Posted by Mark-5.7

BTW, love the drop in. First thing I did was lay about 100 ft of rubber & sounds better too!

Yeah it's definitely better than the stock filter.

In addition to the extra hp, you should also notice improved throttle response.

I had removed (cut out) the charcoal evap filter element from the top of the stock air box as well, to further improve air flow. If you end up doing this be sure to disconnect the air box lid completely and cut out the evap filter (I used a box cutter) over a trash can so you don't end up raining charcoal pellets down into your throttle body intake tube.

[Doubledown]

I'd have to say, as long as your engine isn't pinging, anything above 87 octane is just wasting your money. Just my $.02.

[candyman]

I'm going to Check it out before I add before I add the new air intake, could definitely use another couple of mpg. Last tank only averaged 15 mpg but some of that was pulling a trailer and a bucnh of hills.

[Mark-5.7]

From what I've read about timing & new computers pulling timing (power) because of low octane, you won't hear any ping because the computer pulls timing with the knock sensors. Octane really makes a diff. in my supercharged Regal.