I've posted this before and again I'll leave it here from the FSM

Precautions for Fuel (Unleaded Premium Gasoline Required) NAS0005S
Use unleaded premium gasoline with an octane rating of at least 91 AKI (Anti-Knock Index) number (Research
octane number 96).
If unleaded premium gasoline is not available, unleaded regular gasoline with an octane rating of at least 87
AKI number (Research octane number 91) can be used, but only under the following precautions:
. have the fuel tank filled only partially with unleaded regular gasoline, and fill up with unleaded premium
gasoline as soon as possible.
.avoid full throttle driving and abrupt acceleration.
However, for maximum vehicle performance, the use of unleaded premium gasoline is recommended.
CAUTION:
Do not use leaded gasoline. Using leaded gasoline will damage the three way catalyst. Do not use E-85
fuel (85% fuel ethanol, 15% unleaded gasoline) unless the vehicle is specifically designed for E-85 fuel
(i.e. Flexible Fuel Vehicle - FFV models). Using a fuel other than that specified could adversely affect
the emission control devices and systems, and could also affect the warranty coverage validity.

 

The key word here is anti-kock index. Yes, the car has knock sensors. But if they fail, the engine will not correct the timing. It's clear that infiniti is pushing towards the 91+ octane, or they wouldn't tell you to only fill the tank partially with 87 until you can find 91. If you're willing to sacrifice performance, buy a prius.

 

My thoughts exactly on the sensors. If they fail you would regret not going with premium.

 

For clarity, that's (the copy/paste above) only applicable for the VQ37 engine, not the VQ35. They are obviously tuned differently. The owner's manual, which 99.9% of owners might read, vs the FSM, says nothing about only partially filling with standard grade until you get get premium. Infiniti recommends premium and only says you "may" notice a performance change.

At the end of the day, let people put whatever they want in (definitely in the case of the VQ35) and live happy.

 

This is from the 06 g35 coupe, which covers the vq35de. The owners manual has about 1/4 of the information the FSM has. I read my owners manual right after buying my car to check which gas is recommended and pretty sure it said the same thing about filling with 87 till you can top it off with 91

 

To my surprise, the owners manual actually had more information on the fuel than the FSM. I'm not hating on anyone using regular in their car, it's just not my way to save money. Not sure why these pics came out sideways

 

LOL at this thread. Wondering if any new 2017+ Q60 owners are putting the lowest grade gas on their car to "save money". Get a Civic. Problem solved!

 

 

It's usually only a $3-10 difference at fill up near me. It used to only be $2 difference. The recent hike in premium fuel cost sucks. $0.50 more a gallon.


For me the gas mileage difference is worth it alone.

I get Terrible city mileage though.

 

Exactly! It costs like 5 bucks extra per tank, not a risk worth saving 5 dollars over, especially if you're like I am and enjoy driving the car like it was meant to be driven. Also yeah I get 13 mpg in the city 😂 but I can get 400 miles a tank on the freeway

 

Yeah it's stupid. But for 6 months of summer I take the MC's which usually get 50+ mpg so I'm just a nag.

 

I run premium in my F150, costs 10 to 12 more per tank but I get better throttle response. I tried a couple of tanks of regular and wasn't happy with the throttle lag.

Never tried regular in the G which is my "economy car" and never will.

.50 is about the average premium for premium here. I'd rather pay a little extra and enjoy driving it instead of saving a few bucks and risk problems.

 

$12 more per tank by me. Just took my first highway trip with the G and got 24.9 MPG which would be close to 500 miles on a tank. Car runs awesome!

 

Reading this today in my news feed reminded me of this thread.

Bad Gas At NJ Station Disables 13 Vehicles In Monmouth County

https://patch.com/new-jersey/asbury-...onmouth-county

Official NASCAR fuel no less

I'll stick with WaWa regular!



FWIW my Q70 runs fine on it

Telcoman

 

Are you running ethanol free? I can't understand how you keep getting best MPG. I grandma a tank in the winter for 17/24 mpg and 20/27 in summer.