Whipple and Gas Quality (Costco)

HoldenTX said:

That's not correct. The gas you are buying from a BP gas station is just as likely to sell gas made by Exxon or Phillip's as from BPs refinery. All refiners ship to central depots and the gasoline is mixed together.
Next time you see a tanker refilling a gas station, watch where it goes next.

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It goes to the terminal to load. The huge tanks you see there hold premium in one tank, reg in one tank, and ethanol in another. Everything is blended at the rack, that is where additives are added to make it branded gas. It’s all the same gas with different additives. I use to drive a gas tanker and deliver to stations and ethanol to terminals. This is what it is.

using Costco Tier1 91 in my Cali Whipped Raptor - no issues at all

Toadster said:

using Costco Tier1 91 in my Cali Whipped Raptor - no issues at all

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I believe that's because you have the 91 octane Tune.
I'm running the 93 Tune with my Stage II Whipple setup.
Once I upgrade to the Gen 3 compressor, things may change again, I hope not.

I used to use only Sunoco until they changed about four years and I started getting pinging from them.
That made try all the others till I found BP here in NYC to be the best for me.

Just buy good gas

Costco vs Synergy+ Gas Comparison


Mobil/Exxon recently introduced a new premium fuel with a 93-octane rating and no ethanol. They are making several claims about this new fuel blend including cleaner engines, better fuel economy and better engine performance. I decide to compare my Stock 25,000-mile 2018 Gen 2 Raptor with my normal Costco premium gas to the new Synergy fuel.


My Current Fuel Economy is as follows:



Costco 91 with ethanol Synergy+ 93


Hwy fuel economy 18.5 mpg 20 mpg (Ave speed 65 mph on cruise control)


City fuel economy 17 mpg 18 mpg


For the performance claim my comparison will be subjective. I drive under the ”Normal” mode with a 50/50 mix of city and highway driving. I would say that I am a slower, speed limit driver with auto stop/start engaged. However, I did notice an increase in performance. My acceleration, especially when merging on to the highway and passing other drivers seemed more spirited. For the cleaner engine claim, I have no way to test. Since both fuels are ”Top Tier” fuels I will call it a tie.


Now for the price difference. In my area Costco fuel is $2.68 per gallon while Synergy+ is $3.03 for a difference of .35 per gallon. Total difference per fill-up is $12.60. With an average fuel economy of 17.75 mpg under Costco and 19 mpg fuel economy under Synergy+ for a difference of 1.25 mpg. Total increase in mileage per tank is 45 miles (36 gallons x 1.25).

With a cost of $12.60 vs mileage improvement of $7.18 (45 miles/19= 2.3 gallons @ $3.03 per gallon) for a difference of $5.42 for each fill-up from empty.


Tell me your thoughts. Do you agree with my analysis and my math? I am going to switch from Costco to Synergy+ when I can. I am thinking that the higher octane and with no ethanol, it may be a better fuel. Also, with the performance improvement Synergy+ is worth the extra costs. Please respond with your observations. Has anyone else tried Synergy+?

wmb3 said:

Costco vs Synergy+ Gas Comparison


Mobil/Exxon recently introduced a new premium fuel with a 93-octane rating and no ethanol. They are making several claims about this new fuel blend including cleaner engines, better fuel economy and better engine performance. I decide to compare my Stock 25,000-mile 2018 Gen 2 Raptor with my normal Costco premium gas to the new Synergy fuel.


My Current Fuel Economy is as follows:



Costco 91 with ethanol Synergy+ 93


Hwy fuel economy 18.5 mpg 20 mpg (Ave speed 65 mph on cruise control)


City fuel economy 17 mpg 18 mpg


For the performance claim my comparison will be subjective. I drive under the ”Normal” mode with a 50/50 mix of city and highway driving. I would say that I am a slower, speed limit driver with auto stop/start engaged. However, I did notice an increase in performance. My acceleration, especially when merging on to the highway and passing other drivers seemed more spirited. For the cleaner engine claim, I have no way to test. Since both fuels are ”Top Tier” fuels I will call it a tie.


Now for the price difference. In my area Costco fuel is $2.68 per gallon while Synergy+ is $3.03 for a difference of .35 per gallon. Total difference per fill-up is $12.60. With an average fuel economy of 17.75 mpg under Costco and 19 mpg fuel economy under Synergy+ for a difference of 1.25 mpg. Total increase in mileage per tank is 45 miles (36 gallons x 1.25).

With a cost of $12.60 vs mileage improvement of $7.18 (45 miles/19= 2.3 gallons @ $3.03 per gallon) for a difference of $5.42 for each fill-up from empty.


Tell me your thoughts. Do you agree with my analysis and my math? I am going to switch from Costco to Synergy+ when I can. I am thinking that the higher octane and with no ethanol, it may be a better fuel. Also, with the performance improvement Synergy+ is worth the extra costs. Please respond with your observations. Has anyone else tried Synergy+?

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How big of a sample size did you use to get the average mpg per tank? There are way too many variables (winter blends, driving conditions, vehicle break-in, etc )to attribute a 7% increase in fuel economy to a different brand of fuel. I have run Costco premium in my gen 2 for all 8,000 miles save for a tank or three and can’t tell any difference.

edit-just realized your Costco sells 91, whereas 93 is available at mine. I still doubt a significant increase in mpg from going up in octane or switching brands. We don’t have ethanol free fuel near me but that is where the increase in mpg is coming from. You will get the best mpg using the lowest octane fuel that doesn’t detonate and has the least amount of ethanol.

wmb3 said:

Costco vs Synergy+ Gas Comparison


Mobil/Exxon recently introduced a new premium fuel with a 93-octane rating and no ethanol. They are making several claims about this new fuel blend including cleaner engines, better fuel economy and better engine performance. I decide to compare my Stock 25,000-mile 2018 Gen 2 Raptor with my normal Costco premium gas to the new Synergy fuel.


My Current Fuel Economy is as follows:



Costco 91 with ethanol Synergy+ 93


Hwy fuel economy 18.5 mpg 20 mpg (Ave speed 65 mph on cruise control)


City fuel economy 17 mpg 18 mpg


For the performance claim my comparison will be subjective. I drive under the ”Normal” mode with a 50/50 mix of city and highway driving. I would say that I am a slower, speed limit driver with auto stop/start engaged. However, I did notice an increase in performance. My acceleration, especially when merging on to the highway and passing other drivers seemed more spirited. For the cleaner engine claim, I have no way to test. Since both fuels are ”Top Tier” fuels I will call it a tie.


Now for the price difference. In my area Costco fuel is $2.68 per gallon while Synergy+ is $3.03 for a difference of .35 per gallon. Total difference per fill-up is $12.60. With an average fuel economy of 17.75 mpg under Costco and 19 mpg fuel economy under Synergy+ for a difference of 1.25 mpg. Total increase in mileage per tank is 45 miles (36 gallons x 1.25).

With a cost of $12.60 vs mileage improvement of $7.18 (45 miles/19= 2.3 gallons @ $3.03 per gallon) for a difference of $5.42 for each fill-up from empty.


Tell me your thoughts. Do you agree with my analysis and my math? I am going to switch from Costco to Synergy+ when I can. I am thinking that the higher octane and with no ethanol, it may be a better fuel. Also, with the performance improvement Synergy+ is worth the extra costs. Please respond with your observations. Has anyone else tried Synergy+?

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I hope 65 mph was for the sake of research! In upstate ny our 93oct has ethanol. Non ethanol is only 91oct.

Hi...JasonSTL...my home town. I grew up in Webster Groves. My sample size was only two full tanks.

wmb3 said:

Hi...JasonSTL...my home town. I grew up in Webster Groves. My sample size was only two full tanks.

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Are you able to get the Synergy without ethanol in the St. Louis area? I live in Wildwood.