Tuned at 93 Octane Question for Road Trippers
Thread Starter
Super Member
Joined: Nov 2016
Posts: 603
Likes: 275
From: NYC
S63, GLE580, BV250
Tuned at 93 Octane Question for Road Trippers
Took a trip up from NYC to Montreal & Quebec City recently and realized that outside of Montreal going north only 91 is available (my tank lasted with 93 in it for the round trip but it was getting low). In NYC and surrounding states 93 octane is readily available, i'm ecu tuned for 93 also. Just wondering what other 93 tuned guys do for longer distance drives where 91 octane is the max available at the pumps. Octane Booster? Run with 91 with more conservative driving? Knock sensors still compensate when 93 tuned?
I poked around online/reddit and didnt really walk away with any good information.
I poked around online/reddit and didnt really walk away with any good information.
Super Member
Joined: Mar 2019
Posts: 573
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From: Half Moon Bay, CA
2016 S550e, 2005 Nissan Xterra 4x4, 1984 300ZX
I can only buy 91 in CA and I have added octane booster to see if the power and gas mileage was any different. I haven't done any tuning (not sure the 550e has available tune) but mileage and power seemed the same with and without the booster.
Super Member
Joined: Aug 2013
Posts: 779
Likes: 205
From: Texas
63 Falcon vert
Took a trip up from NYC to Montreal & Quebec City recently and realized that outside of Montreal going north only 91 is available (my tank lasted with 93 in it for the round trip but it was getting low). In NYC and surrounding states 93 octane is readily available, i'm ecu tuned for 93 also. Just wondering what other 93 tuned guys do for longer distance drives where 91 octane is the max available at the pumps. Octane Booster? Run with 91 with more conservative driving? Knock sensors still compensate when 93 tuned?
I poked around online/reddit and didnt really walk away with any good information.
I poked around online/reddit and didnt really walk away with any good information.
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,173
Likes: 431
S600
A lot of this octane stuff is dependent on how you use the car.
a) if you are always flooring the throttle--you best stick with as high an octane as you can get.
b) if you ease away from stops and ease up to cruising velocity--you need nothing more than mid-range gas.
c) live in mountains and use cruise control up and down hills--probably better to stick to higher octane
d) live near sea level and use throttle to keep distance from others--best to stick with higher octanes.
I use mid-grade gasoline with nary an issue in 7 years.
a) if you are always flooring the throttle--you best stick with as high an octane as you can get.
b) if you ease away from stops and ease up to cruising velocity--you need nothing more than mid-range gas.
c) live in mountains and use cruise control up and down hills--probably better to stick to higher octane
d) live near sea level and use throttle to keep distance from others--best to stick with higher octanes.
I use mid-grade gasoline with nary an issue in 7 years.
Thread Starter
Super Member
Joined: Nov 2016
Posts: 603
Likes: 275
From: NYC
S63, GLE580, BV250
Thanks for all of the comments, I know that 91 for stock mapping wont be an issue. Looking for input from what 93 tuned guys do when they have road trips into areas where pump premium is 91 only.
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MBWorld Fanatic!
Joined: Oct 2002
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From: Cincinnati
2010 E350 4Matic
As Mr Alsup suggested just keep your foot out of it when you are running the lower octane fuel.
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Senior Member
Joined: Mar 2022
Posts: 409
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From: Atlanta, GA
2020 S450 4Matic, 2022 GLS450 4Matic, 2015 C300
Mid grade is 89 here in GA, we have 87, 89 and premium, which don’t remember whether it’s 91 or 93! I’ve been using it for years, and it shows how little attention I show when I’m at the pump 🤦🏻♂️
I just filled up, we have 93 in GA!
I just filled up, we have 93 in GA!
Last edited by will_atl; Dec 16, 2022 at 04:14 PM.
Member
Joined: Jul 2020
Posts: 114
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From: So CALi
| 2015 S63 / 2013 5.7 Tundra |
I have a handheld that lets me switch my tune from stock to moded (91) to race (93) since CA smog now can see a moded tune.
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Joined: Aug 2013
Posts: 779
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From: Texas
63 Falcon vert
