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Mercedes SL 500 AMG Sport 1997
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77 Posts
Discussion Starter #1
Hi!
What is yours average fuel consumption on SL500?
I have now driven couple of fuel tanks empty and my average is 12,5 litres per 100km.
Thats including highway and city driving.
Thats not very much for V8 in my mind.
 

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MB SL600, MB 380SE, Suzuki Grand Vitara, 38' Chris-Craft, Volvo V70XC, and my own two feet...
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4,131 Posts
The 500's are pretty efficient. Our M119-powered 500 gets 25-30mpg on the highway, and maybe 18 or so around town. And that's with actually driving it, not babying it and watching the mpg guage the whole time. Pretty darn good for a 315hp V8.
 

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2004 SL 55 AMG
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98 Posts
My worst tank - 19 MPG (some spirited back road driving) Best tank - 24 MPG. It usually ranges between 21 to 23. I use 93 octane. I have a 94 SL 500, which was before the electronic controlled transmission with overdrive.

Phil
 

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1992 500SL, 1988 560SL, 1977 450SL, 1999 E320 4matic
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773 Posts
My 92 500 SL is now getting 17-18 MPG city and hwy driving. I drive my car every single day. Before New 02 sensor and injectors were installed I could only get 13 MPG (City and Highway).
carltwo
 

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1998 SL500 Black/Black/Black
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124 Posts
California to South dakota, first trip bringing my 98 home I averaged 24.75 mpg, best tank was 27.7 worst was 19.9. The 19.9 included some sustained high speed accross the nevada desert travel :) ! In general i was on the freeway and had the cruise set at 80 mph for the duration of the trip.

I was pretty happy!
 

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MB SL600, MB 380SE, Suzuki Grand Vitara, 38' Chris-Craft, Volvo V70XC, and my own two feet...
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I think what we're discovering is that there's a major economy difference between the 4-speed and 5-speed transmissions, especially on the highway. It appears as though the 4-speed SL500's are getting 5-10mpg less than the 5-speeds.
 

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Departed 1998 SL500 (and the Pano is in Bogota)
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The 4-sp does not come with a locking torque converter like those on the electronically controlled 5-sp (which is also 40+ lbs lighter than the hydraulically controlled 4-sp).
 

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MB SL600, MB 380SE, Suzuki Grand Vitara, 38' Chris-Craft, Volvo V70XC, and my own two feet...
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I drive everwhere at about 70 mph and for the last 40K miles I get 20mpg.
If that's combined driving, then that's about normal. If that's highway driving, then your fuel economy is a bit low.

Even the post-2006 revised government figures (which are notoriously low) are still a bit higher than what you're seeing, if that 20mpg is highway driving and not a combined figure.
 

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1999 SL500
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89 Posts
Thanks for the previous post... The 20 mpg is combined even though I do a lot of freeway driving. I tend to reach my cruising speed fairly quickly and have been known to make "emergency" lane changes to avoid slower traffic now and then. (Not to mention that there are some 15mph curves and a couple of roundabouts between home and work that my car likes test.)
 

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SL500 (R129), 500 SEC (W126)
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303 Posts
1999 with the M113 motor, 5 speed 722.6 transmission, 168k miles. I get 23mpg as a rule. Very rarely less than 20mpg and sometimes as much as 27mpg.

Most I have had from a tank is 450miles. There was about 6litres left in it.

In my experience (formed over 130k miles) the car is most efficient at a steady 95mph cruise.
 

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1992 500SL, 1988 560SL, 1977 450SL, 1999 E320 4matic
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773 Posts
1999 with the M113 motor, 5 speed 722.6 transmission, 168k miles. I get 23mpg as a rule. Very rarely less than 20mpg and sometimes as much as 27mpg.

Most I have had from a tank is 450miles. There was about 6litres left in it.

In my experience (formed over 130k miles) the car is most efficient at a steady 95mph cruise.
jjrodger,
450 miles on a full tank of gas, incredible... Are the fuel tanks larger than the earlier 129 or the same??
 

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MB SL600, MB 380SE, Suzuki Grand Vitara, 38' Chris-Craft, Volvo V70XC, and my own two feet...
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jjrodger,
450 miles on a full tank of gas, incredible... Are the fuel tanks larger than the earlier 129 or the same??
450 is pretty darned good! I usually get about 300-320 miles in combined driving (depending on how I drive) out of the 18 gallons or so I normally burn in the SL600 between fillups. 18 gallons is approximately the difference between a full tank and the warning light coming on. I never manage to run the tank much lower than that level, because I can't stand looking at warning lights.

My dad's 1998 SL500 is significantly more efficient, his car will do around 340-350 miles between fillups in combined driving. With highway driving only, the M120 turns in around 330-340 miles, and the M119 gets up around 400 miles.

I guess I didn't realize before we started talking about it, but for such small cars, the R129's sure have large gas tanks. My R129 has a bigger tank than my E38 7-series did, and a much larger tank than my midsize SUV. To my knowledge, the fuel tank size was never changed between model years.
 

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2000 Obsidian Black Metallic Mercedes SL 320 V6
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No in fact as far as I can remember the fuel tank has always been the same but to my knowledge (I might be wrong tho) the M113 should be more fuel efficient than the M119 so I'm not surprised. On the twisty motorway from my home here in Italy and the little place I have in France I usually manage about 400 miles in my CL 500 that's the round trip considering that the CL is a much heavier car and the speed limits here on the motorway are usually higher than in the US (80 MPH is the norm here) and I'm not very respectful lol.

Cheers.
 

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Departed 1998 SL500 (and the Pano is in Bogota)
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The R129 got a 21 (US) gal tank, so if you leave 1 gal as reserve then 450m/20g=22.5 MPG
keep in mind jjrodger is from the UK, so his 27-mpg is in Imperial gallons.
 

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1992 500SL, 1988 560SL, 1977 450SL, 1999 E320 4matic
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773 Posts
RKH
That sounds more like it, so jjrodgers told us in "Imperial gallons" and not US gallons. Big differences, makes me feel better now.
carltwo
 

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1999 sl500
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219 Posts
wow im averaging 10-11 mpg city driving and I really dont stomp on it... Highway though... I avg about 25mpg. To be honest my 07 BMW 328 used to return maybe 13 if I was lucky city driving. But abused the crap out of it and its a stick
 

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1996 SL500
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77 Posts
Hmmm, over the last 25k miles or so, my average is 17.5mpg (about half highway, half city). So why is it so low? Car drives well; no obvious problems. Any thoughts on what to check?
 

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00 SL500 SOLD, 05 SL600 Sport, 09 Silverado 4x4 LTZ,SOLD '15Silverado LTZ 6.2 8Speed John Deere 318
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1,781 Posts
Just rechecked Mine, 23.8 MPG ( This is with fuel containing 10% alcohol) I was NOT impressed!!!!! Last year, With better fuel, I got over 25.5 MPG. Looks like those days are gone!!!!!!!!
 
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