87 octane, in all areas, at all elevations, during all seasons.Is 87 octane the definitely the lowest octane to be used in the Ascent?
Thank you Robert.Is 87 octane the definitely the lowest octane to be used in the Ascent?
I run mid to high grade when towing in hot weather in the mountains. Sure it will run on 87, but i tend to think 87 is more prone to detonation and turbo 4s are already inherently prone to this with 87. The ECU will adjust timing on 87 to avoid it and will also dump in more fuel to cool the engine, but will i get maximum performance on 87....i'm not sure and figure running mid to high grade is best when towing with these types of engines.
I usually go by what the owner’s manual says. 87 is the norm.Is 87 octane the definitely the lowest octane to be used in the Ascent?
Why do you feel that way? This engine isn't designed to require higher octane (slower burning) fuel, unlike many of the turbos on some other brands or older in design where there is higher compression and pre-disposition to pre-detonation. (knocking)When you're working a turbo motor harder than usual, it's good to increase the octane.
Since higher octane burns slower, it burns slightly cooler, offsetting the extra heat generated by running it hard. Also, pushing the engine hard increases the chance of pre-ignition, which would cause the ECU to retard the timing, reducing your power. Running higher octane greatly reduces chance of pre-ignition, so no timing retard & no power reduction.Why do you feel that way? This engine isn't designed to require higher octane (slower burning) fuel, unlike many of the turbos on some other brands or older in design where there is higher compression and pre-disposition to pre-detonation. (knocking)
The additives are found in Top Tier fuels regardless of octane.^^ what he said, with one added thought...
while you may not see a performance difference with a higher octane, part of the price difference is the premium detergents and additives in the premium fuel. So my question is if it may be beneficial to run a tank of 93 thru every once in a while for that reason?
I don't think I've ever noticed the Top Tier logo at Exxon or Sunoco but now I'll actually look for it. Good info, thanks! Does anyone actually use Citgo or BP? They're always $ .10-.20 higher priced than everyone else from what I've seen.The additives are found in Top Tier fuels regardless of octane.
while traveling I am mindful of the top tier fuel brands. Locally I know where they all are and generally the comparative prices. With my older vehicle, I used to purchase fuel from the grocery stores since I received a discount but I was experiencing poor performace and contaminated fuel. Now all my vehicles use only top tier fuel. While traveling I can request through google to find a top tier fuel station and it pops up on the map along my route.I don't think I've ever noticed the Top Tier logo at Exxon or Sunoco but now I'll actually look for it. Good info, thanks! Does anyone actually use Citgo or BP? They're always $ .10-.20 higher priced than everyone else from what I've seen.
So using Top Tier gas is probably more beneficial than using higher octane is my take on this.