High Octane fuel in ES
Thread Starter
10th Gear
Joined: Dec 2025
Posts: 11
Likes: 12
From: TX
High Octane fuel in ES
I have a 2025 ES-350 UL and normally run regular (87 octane) fuel as recommended by the manual. Would occasionally running premium (91-94 octane) fuel cause any issues? I doubt that it would cause any problems but thought I'd pose the question anyway.
Rookie
Joined: Dec 2025
Posts: 33
Likes: 26
No issues, octane rating is just a measure of fuel quality (higher detergents, better combustion). I run 2 tanks of 91 on my 2025 ES300h every 5,000 miles to clean my engine from potential carbon deposits that accumulate in direct injection systems.
Even on cars that require 91, running 87 on them will be fine, it will just lose a little bit of performance.
Even on cars that require 91, running 87 on them will be fine, it will just lose a little bit of performance.
Intermediate
Joined: Feb 2015
Posts: 378
Likes: 94
From: CT
Done this since day 1 on our 2015 ES and regular octane has caused zero issues with the car. Costco sells top tier rated fuel and its usually the cheapest in our area.
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Intermediate
Joined: Feb 2025
Posts: 257
Likes: 101
No issues, octane rating is just a measure of fuel quality (higher detergents, better combustion). I run 2 tanks of 91 on my 2025 ES300h every 5,000 miles to clean my engine from potential carbon deposits that accumulate in direct injection systems.
Even on cars that require 91, running 87 on them will be fine, it will just lose a little bit of performance.
Even on cars that require 91, running 87 on them will be fine, it will just lose a little bit of performance.
Driver School Candidate
Joined: Jan 2026
Posts: 15
Likes: 5
Using “Top Tier” gas (as recommended by most automotive companies including Toyota/Lexus) is what will keep your engine clean and carbon buildup free. You can find the places that sell Top Tier gasoline online, many companies do, but some like Sam’s, Pride and Cumberland Farms do not (Costco does).
https://www.toptiergas.com
https://www.toptiergas.com
Instructor
Joined: Aug 2023
Posts: 1,015
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From: PR
Last edited by scubapr; Jan 24, 2026 at 07:59 AM. Reason: Typo
Lead Lap
Joined: Nov 2013
Posts: 4,320
Likes: 1,233
From: IL
Historical note: Premium (High Test, Ethyl) higher octane fuel used to have the cleaning additives that Regular did not. Filling a tank with Premium would have some of the benefits we are attributing to the use of additive products mentioned here.
Pit Crew
Joined: Nov 2024
Posts: 116
Likes: 63
From: PA
Has anyone tried TopTier+ fuel? Top Tier has a new higher grade of gasoline. I have yet to find it anywhere though.
https://www.toptiergas.com/top-tier-plus/
https://www.toptiergas.com/top-tier-plus/
Driver School Candidate
Joined: Jan 2026
Posts: 15
Likes: 5
Has anyone tried TopTier+ fuel? Top Tier has a new higher grade of gasoline. I have yet to find it anywhere though.
https://www.toptiergas.com/top-tier-plus/
https://www.toptiergas.com/top-tier-plus/