Top Tier Fuel for your 392

CBH · Dec 7, 2021

In the owner’s manual it states:

"Designated TOP TIER Detergent Gasoline contains a higher level of detergents to further aide in minimizing engine and fuel system deposits. When available, the usage of TOP TIER Detergent gasoline is recommended. Visit www.toptiergas.com for a list of TOP TIER Detergent Gasoline Retailers."

When I owned a Challenger 392 I put BP gasoline in it because I was told “this is a high performance engine” so I treated it as such. However, BP is no longer on the Top Tier list (in the US at least), so I may need to find another brand.

Is anyone going out of their way to put “Top Tier” fuel in their 392?

dblplay1212 · Dec 7, 2021

Manual says 91 gas, but 93 would be better, right?

Idaho392 · Dec 7, 2021

I found a local station (Sinclair brand) that has 91 ethanol free, so that's what I use (along with my octane booster to get it up to 93 for my tune). There are no stations in my region (possibly state) that carry 93 octane.

CBH · Dec 7, 2021

tjohnson said:
I found a local station (Sinclair brand) that has 91 ethanol free, so that's what I use (along with my octane booster to get it up to 93 for my tune). There are no stations in my region (possibly state) that carry 93 octane.

93 octane is readily available here; however, since Top Tier fuel supposedly “contains a higher level of detergents” I’m willing to seek out Top Tier Stations if it really matters....

Viking Jeeper · Dec 7, 2021

Top Tier is a marketing ploy. Their fuel may have a different additive but thats different than 91 vs 93 Octane.

CBH · Dec 7, 2021

Viking Jeeper said:
Top Tier is a marketing ploy. Their fuel may have a different additive but thats different than 91 vs 93 Octane.

You mean like Nitrogen in tires? There may be some chemical advantage but the difference is not significant enough to matter..

RMDCJeep · Dec 7, 2021

tjohnson said:
I found a local station (Sinclair brand) that has 91 ethanol free, so that's what I use (along with my octane booster to get it up to 93 for my tune). There are no stations in my region (possibly state) that carry 93 octane.

what stoich is your tune setup for?
14.7 ethanol free
14.1 E10
OEM calibration of 14.54
I've never seen a road-going vehicle make more power on non-ethanol fuel, and 10% ethanol isn't doing jack to anyone's fuel system. All FCA vehicles run a calibration to be able to run up to E15 and adjust trims as needed.

RMDCJeep · Dec 7, 2021

Viking Jeeper said:
Top Tier is a marketing ploy. Their fuel may have a different additive but thats different than 91 vs 93 Octane.

Top tier might be marketing BS. But labeled 93 fuels don't perform the same exact way, go datalog a vehicle on Sunoco 93, Shell 93, and BP... it's not an even playing field and you'll find some allow more timing than others.

Based on my history of 1000s of miles logging tuned and OEM calibrations it lays out like this - where 93 is available.
Shell V-Power
Sunoco 93
BP 93

Tejas392 · Dec 7, 2021

I have been in the fuel distribution business my entire life. All fuels have a minimum additive and detergent requirement. The Top tier fuels have additional additives and proprietary blends to enhance clean burning. Octane basically measures the fuels stability, the higher it is the the more stable. This generally means more uniform combustion.

CBH · Dec 7, 2021

Tejas392 said:
I have been in the fuel distribution business my entire life. All fuels have a minimum additive and detergent requirement. The Top tier fuels have additional additives and proprietary blends to enhance clean burning. Octane basically measures the fuels stability, the higher it is the the more stable. This generally means more uniform combustion.

Do you use Top Tier fuel in your vehicles?

jmwillia · Dec 7, 2021

Only have 91 octane at Casey's here in Dodge, Casey's in Pratt which is 76 miles away has 93 octane and makes a big difference in how my jeep runs and sounds. They both are no ethanol.

buzzarr · Dec 7, 2021

I only run shell in my cars and I don't know why this is but my cars run better on shell gas at least here in co

Tejas392 · Dec 7, 2021

CBH said:
Do you use Top Tier fuel in your vehicles?

I do, Shell 93 Vpower because that is our truck stop that my office is behind. I like Chevron and Exxon additives, Valero has been top tier for a while now. Costco's gasoline is top tier also but I have never used it, there is not one near me. As I said before all gasoline has some additives but the majors spend a lot of money trying to differentiate there blends and a lot marketing it. I think it probably is better not amazingly like your engine will last for a hundred years. We have lots of customers say their vehicles run better and they get better mileage. I personally do not pay that much attention but I do use it.

CBH · Dec 7, 2021

Tejas392 said:
I do, Shell 93 Vpower because that is our truck stop that my office is behind. I like Chevron and Exxon additives, Valero has been top tier for a while now. Costco's gasoline is top tier also but I have never used it, there is not one near me. As I said before all gasoline has some additives but the majors spend a lot of money trying to differentiate there blends and a lot marketing it. I think it probably is better not amazingly like your engine will last for a hundred years. We have lots of customers say their vehicles run better and they get better mileage. I personally do not pay that much attention but I do use it.

I have a Shell Station/Circle K nearby. If they sell Shell 93 VPower then I’ll start gassing up there. Thanks for the advice.

byhumba · Dec 7, 2021

Most gas stations in CA are top tier, but from the list here I think it's most major gas brands in the USA.

Fuel Stations - TOP TIER™

TOP TIER™ Licensed Brands prominently display the TOP TIER™ logo on the pump, pump handle, canopy or in a station window.

www.toptiergas.com

Viking Jeeper · Dec 8, 2021

All of my vehicles have run better after a full detail and wax job.

CBH · Dec 8, 2021

Viking Jeeper said:
All of my vehicles have run better after a full detail and wax job.

I agree. You could probably prove that scientifically by comparing the coefficient of drag for a clean vs. dirty vehicle; although I suspect the difference would be negligible for a Wrangler.

buzzarr · Dec 8, 2021

CBH said:
I agree. You could probably prove that scientifically by comparing the coefficient of drag for a clean vs. dirty vehicle; although I suspect the difference would be negligible for a Wrangler.

Lol

Idaho392 · Dec 8, 2021

RMDCJeep said:
what stoich is your tune setup for?
14.7 ethanol free
14.1 E10
OEM calibration of 14.54
I've never seen a road-going vehicle make more power on non-ethanol fuel, and 10% ethanol isn't doing jack to anyone's fuel system. All FCA vehicles run a calibration to be able to run up to E15 and adjust trims as needed.

You are speaking way above my head regarding the stoich... but I will contact Livernois and find out more info about the tune.