I have been filling my son's A Spec with Costco premium

[JLSuperfly]

Am I wasting money?
FYI, we only get 91 octane in California. His drive is only 4 miles each way to high school.

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[UWU-mancer]

No. You’re not wasting money

Costco fuel holds a top tier certification. And is probably the cheapest available top tier fuel available in many many cities

the motor does indeed require premium fuel

not sure if this particular model can adjust itself to run on regular but some models can. For example, my wife’s VW Taos can run on regular. However it occasionally runs rough. And sometimes won’t idle very smoothly either. So I started pumping premium shell into it and the vehicle feels like a million bucks! So if you wanna try that on the Integra, check out the manual in the glove box. See if it can run on regular? I wouldn’t do it myself, personally. But maybe it’s an option for you?

also. Tell him to get a job if he wants to keep driving

three of our four are adults. And they’ve all had jobs since 10th grade. And as soon as the high school diploma was in hand they all moved out

“this ain’t no picnic mother fucker”

I’ll let you borrow my favorite line

 

[SlippyFist]

not sure if this particular model can adjust itself to run on regular but some models can.

isn't that standard for basically all cars now, particularly ones that are defaulted for premium? my 9th gen civic Si did this lol. I never needed to put 89 in it but the engine will re (de?) tune itself for it

 

[UWU-mancer]

isn't that standard for basically all cars now, particularly ones that are defaulted for premium? my 9th gen civic Si did this lol. I never needed to put 89 in it but the engine will re (de?) tune itself for it

Some can. Some can’t.

I’m not speaking to the most modern of engines but the last sti. The ej257. U did not want to put cheap gas in that. And the va WRX, the fa20 motor. It did not like anything other than premium. In fact on the fa20 motor, regular octane would immediately drop the dynamic advance multiplier by a crap ton. It was like losing half of your power. And god forbid you accidentally hit a single pound of boost too

some engines can. And they can detune and run fine. Others can and they detune themselves and run in such a way that would make U feel concerned.

there’s a ton of variables too tho. Does the car have a barometer sensor. Altitude. How aggressive is one pushing the car. Ambient temps. Yada yada.

 

[JLSuperfly]

It had two bars when I refilled today at Costco. It took a whopping 9 gallons. These tanks are tiny. Lol

 

[justa335i]

It had two bars when I refilled today at Costco. It took a whopping 9 gallons. These tanks are tiny. Lol

Yup, my only real complaint with the car but i get it. Its a compact car.
It would be nice if it was 14 gallons. I would love another 100 miles of range!

 

[UWU-mancer]

It had two bars when I refilled today at Costco. It took a whopping 9 gallons. These tanks are tiny. Lol

They really are

I always fill up at half a tank. It’s usually 5-5.5 gallons

 

[JLSuperfly]

Yup, my only real complaint with the car but i get it. Its a compact car.
It would be nice if it was 14 gallons. I would love another 100 miles of range!

It's nice that these cars get great mpg.

 

[justa335i]

It's nice that these cars get great mpg.

Depending on how much i want the Sport+ pops and bangs lol.
Normal? 27/28 mpg and get ~320 miles a tank
Crazy? 21/22 mpgand get closer to ~260

Mines a 2025 with 21k, so i drive alot

 

[3rdcoast]

What does the sticker inside the gas filler door say? My '23 said 87 octane minimum.

 

[JLSuperfly]

What does the sticker inside the gas filler door say? My '23 said 87 octane minimum.

I will take a look but from Google AI.

• Recommended (Premium): For the best power, responsiveness, and fuel economy, especially if you enjoy spirited driving.
• Acceptable (Regular): The engine can adapt and run on regular gas, but you might notice a slight decrease in performance and MPG.

The question is, does the reduced mpg by using regular offset the price delta for premium. I guess that depends on the latter.

 

[JLSuperfly]

What does the sticker inside the gas filler door say? My '23 said 87 octane minimum.

My son's is a 2025. It says 91 recommended and 87 octane minimum.

 

[whtciv2k]

Some can. Some can’t.

I’m not speaking to the most modern of engines but the last sti. The ej257. U did not want to put cheap gas in that. And the va WRX, the fa20 motor. It did not like anything other than premium. In fact on the fa20 motor, regular octane would immediately drop the dynamic advance multiplier by a crap ton. It was like losing half of your power. And god forbid you accidentally hit a single pound of boost too

some engines can. And they can detune and run fine. Others can and they detune themselves and run in such a way that would make U feel concerned.

there’s a ton of variables too tho. Does the car have a barometer sensor. Altitude. How aggressive is one pushing the car. Ambient temps. Yada yada.

Yea it all depends MOST cars can adjust for the type of fuel that is in the vehicle. SOME can’t, especially if tuned.

 

[NoelPR]

I will take a look but from Google AI.

• Recommended (Premium): For the best power, responsiveness, and fuel economy, especially if you enjoy spirited driving.
• Acceptable (Regular): The engine can adapt and run on regular gas, but you might notice a slight decrease in performance and MPG.

The question is, does the reduced mpg by using regular offset the price delta for premium. I guess that depends on the latter.

Something to consider is that the adaptation process requires exposing the engine to knock events.
The engine doesn't have an octane sensor, the adjustment only occurs when the knock sensor hears noises (pinging) attributed to knock.
You should avoid that at all costs.

 

[UWU-mancer]

Yea it all depends MOST cars can adjust for the type of fuel that is in the vehicle. SOME can’t, especially if tuned.

It’s interesting because a lot of the VW Taos guys are running regular just fine in their fwd and awd models. But a few of us can’t. I wonder if it’s my elevation? Can’t be fuel quality?

I think op should maybe drive till the gas light comes on. Fill up with half a tank of regular. See what that does? Worse case he can correct by filling the other half with premium and taking it easy till that tank cycles?

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