Gasoline
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Joined: Aug 2003
Posts: 8,881
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From: In my garage
E55, GLS450, GL63, GLE350
I ran regular in mine for around 200k miles. If you are towing or drive aggressively all the time, you should stick with premium. Just cruising on the hwy, regular is the way to go.
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Joined: Jan 2019
Posts: 203
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2012 gl450
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Joined: Nov 2017
Posts: 557
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From: San Francisco Bay Area
2006 R500
I remember reading a while back that someone used a scan tool to watch timing on their 5.0 M113 engine and the only time it pulled timing was under high load on 95+ days (think maintaining highway speed going up steep roads). M113 has a compression ratio of 10:1 while M273 is 10.7:1. You're most likely fine running regular as long as you're not running hard, especially on hot days.
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Joined: Mar 2019
Posts: 85
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From: Covington, La.
GL450
I was coming on here to see if anyone is still using premium and at $5.49 a gallon this morning I will be using regular for a while. And the last long trip we took in our 2012 GL450 it actually got right at 20 mpg on it going the posted speed limit.
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MBWorld Fanatic!
Joined: Aug 2003
Posts: 8,881
Likes: 1,211
From: In my garage
E55, GLS450, GL63, GLE350
I run it in all mine while under warranty since I don't want any excuse for a denial. When warranty runs out, it's regular for the NA engines but I stay with premium for the bi-turbo engines.
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Joined: Jun 2010
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From: Emmett, ID, USA
2007 GL450
Here is a simple test whether the gasoline is bad for the motor. Run a full tank of one gas, normal driving, and monitor the mileage. You can use the trip computer; I used actual pump volume and miles driven.
Ditto for the other gas. Try to keep all else equal.
I did this for a thousand miles on super and then on regular. The mileage was actually slightly higher with the regular. If the knock sensor is being triggered, and the timing retarded as a result, you should see lower fuel economy.
Note I later found that the ECU has a fuel octane setting in it, possibly the result of a learning process on the part of the motor. I suppose it would make sense to change the setting in the ECU to whatever the fuel is if doing a test. This setting is accessible via my Autel MP808; I doubt any non bidirectional tools could change the setting.
.It is possible I could get better performance with 91 or 93 octane and the ECU set appropriately - but I get more-than-adequate mileage (20 mpg at freeway + country road, 40 mph average) and power, so I think I have bigger fish to fry.
Ditto for the other gas. Try to keep all else equal.
I did this for a thousand miles on super and then on regular. The mileage was actually slightly higher with the regular. If the knock sensor is being triggered, and the timing retarded as a result, you should see lower fuel economy.
Note I later found that the ECU has a fuel octane setting in it, possibly the result of a learning process on the part of the motor. I suppose it would make sense to change the setting in the ECU to whatever the fuel is if doing a test. This setting is accessible via my Autel MP808; I doubt any non bidirectional tools could change the setting.
.It is possible I could get better performance with 91 or 93 octane and the ECU set appropriately - but I get more-than-adequate mileage (20 mpg at freeway + country road, 40 mph average) and power, so I think I have bigger fish to fry.
Senior Member
Joined: Apr 2018
Posts: 251
Likes: 13
R350 2008 4Matic Gasoline
Here is a simple test whether the gasoline is bad for the motor. Run a full tank of one gas, normal driving, and monitor the mileage. You can use the trip computer; I used actual pump volume and miles driven.
Ditto for the other gas. Try to keep all else equal.
I did this for a thousand miles on super and then on regular. The mileage was actually slightly higher with the regular. If the knock sensor is being triggered, and the timing retarded as a result, you should see lower fuel economy.
Note I later found that the ECU has a fuel octane setting in it, possibly the result of a learning process on the part of the motor. I suppose it would make sense to change the setting in the ECU to whatever the fuel is if doing a test. This setting is accessible via my Autel MP808; I doubt any non bidirectional tools could change the setting.
.It is possible I could get better performance with 91 or 93 octane and the ECU set appropriately - but I get more-than-adequate mileage (20 mpg at freeway + country road, 40 mph average) and power, so I think I have bigger fish to fry.
Ditto for the other gas. Try to keep all else equal.
I did this for a thousand miles on super and then on regular. The mileage was actually slightly higher with the regular. If the knock sensor is being triggered, and the timing retarded as a result, you should see lower fuel economy.
Note I later found that the ECU has a fuel octane setting in it, possibly the result of a learning process on the part of the motor. I suppose it would make sense to change the setting in the ECU to whatever the fuel is if doing a test. This setting is accessible via my Autel MP808; I doubt any non bidirectional tools could change the setting.
.It is possible I could get better performance with 91 or 93 octane and the ECU set appropriately - but I get more-than-adequate mileage (20 mpg at freeway + country road, 40 mph average) and power, so I think I have bigger fish to fry.
How do you Like your Autel ?? is it the Maxicom 808 ?
