Not sure why you think that...I run 93 im my tuned car calibrated for 93...it's discussed in my post above. You seem to struggling with understanding what I'm saying.The Audi dealer told me that he had a car come back and the top of the motor was destroyed by not running 93 octane, it’s clearly what the Audi dealer stated and the owners manual says
Keep running you low octane fuel️ if it makes you happy
Switching to Premium gasoline
- Thread starter Al
- Start date
AROUND these parts, the price spread between 87 and 93 can be anywhere from 30 cents to over a dollar, depending on the station.
Patman
Staff member
It’s even worse up here in Canada. The spread between Shell 87 and Shell 93 at most stations is anywhere from 35-42 cents PER LITER! So at the top end that’s $1.60 a gallon more!! Thankfully I get a lot of discounts from the Shell app and Air Miles that lessen the cost there (last year I got $90 worth of free gas and during the baseball season Shell was giving me a 22 cent per liter discount on 93)
- Joined
- Feb 15, 2022
- Messages
- 172
Your quote
I've run 87 in an modern Audi rental with the same engine...zero issue driving normally.
It was a rental car. An example of not being "destroyed".
Lets start with what you said "the audi dealer told me"The Audi dealer told me that he had a car come back and the top of the motor was destroyed by not running 93 octane, it’s clearly what the Audi dealer stated and the owners manual says
Keep running you low octane fuel
High quality 100% truthful source there.
I wouldnt doubt its possible but you dont know if the guy had 100k miles on 85 octane out west or any details.
BTW your owners manual
Btw your owners manual.. page 225..
Last edited:
A better corollary would be turbo = dynamic compression, fwiw
Exactly. I ran 87 without drama. It WiLL bloWuP.
I never understood why anyone would want to run 87 octane in a car designed to run best on 93.
Assume the difference in price averages $1.00 a gallon and the car gets 20 miles per gallon and is driven 12,000 miles a year. That is 600 gallons per year, and using premium costs $600 a year more than regular. $600 a year is peanuts compared to the total annual cost of ownership, including insurance, depreciation, scheduled maintenance, and wear items such as brakes and tires.
If you desire a car with some level of performance, would you sacrifice some performance and go cheap on the brakes, tires or motor oil?
I guess when you are standing at the gas pump and looking at the prices, there is a temptation to go cheap?
If you want to buy and pay for 87 octane fuel, you should buy cars that the manufacturer recommends regular. If you buy a car that is designed to run best on premium, only use regular if premium is unavailable.
Assume the difference in price averages $1.00 a gallon and the car gets 20 miles per gallon and is driven 12,000 miles a year. That is 600 gallons per year, and using premium costs $600 a year more than regular. $600 a year is peanuts compared to the total annual cost of ownership, including insurance, depreciation, scheduled maintenance, and wear items such as brakes and tires.
If you desire a car with some level of performance, would you sacrifice some performance and go cheap on the brakes, tires or motor oil?
I guess when you are standing at the gas pump and looking at the prices, there is a temptation to go cheap?
If you want to buy and pay for 87 octane fuel, you should buy cars that the manufacturer recommends regular. If you buy a car that is designed to run best on premium, only use regular if premium is unavailable.
We drove our '08 Lexus RX350 on 87 primarily for 16 years. So 16x$600 @12K/year is almost $10K. I bought my son's Audi for...$10K. There was zero impact on that vehicle running 87 that I could tell...clearly...it ran 16 years trouble free. Now that's not a performance/turbo engine (was the 3 and chang NA V6) but why waste the money if it can back the timing down a bit on some vehicles?
I had a 2019 V6 RX350 and I remember the owners manual recommended regular fuel.
Long ago, I had an AUDI turbo. It would run on regular in cool weather, but in hot weather with the air conditioning on, it ran so poorly on regular that the check engine light would come on at interstate speeds/
A car designed to run optimally on premium will usually get worse fuel economy on regular because the engine management computer enriches the mixture to avoid engine knock, worsening fuel economy
Long ago, I had an AUDI turbo. It would run on regular in cool weather, but in hot weather with the air conditioning on, it ran so poorly on regular that the check engine light would come on at interstate speeds/
A car designed to run optimally on premium will usually get worse fuel economy on regular because the engine management computer enriches the mixture to avoid engine knock, worsening fuel economy
Patman
Staff member
There is a guy on the Corvette Forum who runs 87 octane in his 2017 Corvette because he claims the owners manual says it is recommended
What it actually says is that 93 is recommended but 87 can be used but it will result in reduced acceleration and fuel economy and audible knocking may occur and the engine may be damaged. He seems to have glossed over this vital information 
I figure he must never go full throttle because he lives in Texas and 100 degrees with 87 octane in a Corvette is a recipe for disaster
That had a mom van v6 in it, a bit of premium gas would have gotten you to sams club the same speed on a diaper run. Every penny counts
Curious if a GDI engine would run cleaner on premium grade gas and produce less soot ?
I doubt that. Maybe worth a try. Soot, though???
Has nothing to do with soot.
Similar threads
