M119 vs M113 Fuel Economy; R129 SL vs 210 E Class - Mercedes-Benz Forum
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post #1 of 12 (permalink) Old 08-03-2015, 12:50 AM Thread Starter
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M119 vs M113 Fuel Economy; R129 SL vs 210 E Class

Today on our club drive I wanted to take my mother's 2000 E430 instead of my SL500. I changed the coolant and (original!) radiator hoses and wanted to make sure my mother wouldn't get any "surprises" when she drives it tomorrow. 250 miles today should have purged any air pockets or exposed any leaks.

I was playing around with the menu and the screen that gives cumulative mpg (as of whenever you hit reset I guess) and at a steady 70 on the way back it was indicating 27 mpg - which given that the E Class is probably a few 100 lbs lighter and the engine 700 cc's smaller, certainly believable.

Plus if I understand the engine family correctly the M112 and M113 engines have cylinder deactivation when you are cruising and don't need the power. My SL would have gotten 23, maybe 24 under those circumstances.

However the cumulative driving for the day (me simply dividing the miles driven by gasoline added) yielded 23 mpg - which is about what I would have expected the SL500 to have.

In everyday driving, it seems, there is no appreciable difference between the 2 engines, but any advantage gained by the M113 would have to be when you are just cruising on the freeway with the cruise control activated.

I'd have to say as an everyday car, the E class is far more comfortable - it sits higher and it is far easier to get in and out.

One peculiar thing I have discovered about the R129, discovered early in the ownership - is that despite the huge size of the doors I still have to bend my knee to avoid having my foot scrap along the speaker fabric of the door. You seem to sit a lot lower, too.

In the 129's favor, yesterday I was on a city street with the top down and a young couple in a Camaro offered to trade cars - they liked my car.

Both are great cars and I would say performance on the 2 was virtually identical. The 4.3 M113 had about 45 less hp than my 5 liter M119, but the E Class was probably lighter. Judging by the tach gearing seems close between the 2. I could look up the weights of the 2 cars but it is late and I am tired.
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post #2 of 12 (permalink) Old 08-03-2015, 06:39 AM
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I was able to hit 29 mpg at 80mph highway with my 1993 400E (4.2L M119). With the SL500 5L M113, my best average is 24.5 mpg. If I don't push it past 70mph I could probably hit higher numbers.

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past: 1980 240D Getrag, 1992 190E 2.3, 1993 400E, 1999 SL500
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post #3 of 12 (permalink) Old 08-03-2015, 07:15 AM
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I only care about mileage on my SL insofar as an indicator that everything operating as it should.

Expecting great gas mileage out of 90s-era big V8 is a bit misguided.
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post #4 of 12 (permalink) Old 08-03-2015, 09:20 AM Thread Starter
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Originally Posted by SinSL View Post
I only care about mileage on my SL insofar as an indicator that everything operating as it should.

Expecting great gas mileage out of 90s-era big V8 is a bit misguided.
I'm only comparing mileage insofar as to measure the engine's efficiency. And certainly if we found we were getting 10 mpg (as I had originally with my SL - leaky fuel hose) that would certainly be a turn off

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I was able to hit 29 mpg at 80mph highway with my 1993 400E (4.2L M119). With the SL500 5L M113, my best average is 24.5 mpg. If I don't push it past 70mph I could probably hit higher numbers.

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Interesting about your 400E! Your M113 SL seems to confirm what I have believed - the only advantage in efficiency is when they are cruising at a steady rate and on level ground - otherwise they (M119 vs M113) are about the same

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post #5 of 12 (permalink) Old 08-03-2015, 11:04 AM
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I get 50MPH,going down hill.
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post #6 of 12 (permalink) Old 08-03-2015, 02:52 PM
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50mph!

Downhill!

I would get your engine tuned if I were you...you’re missing out on heaps of fun my friend.

“With its classic proportions and sporty touches, it was an automotive sculpture: The most perfect car of my career” - Bruno Sacco on the R129.
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post #7 of 12 (permalink) Old 08-03-2015, 03:19 PM
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I commute between Rock Hill and Columbia. It's not level ground at accounts for the low averages I hit on the 1999 SL500. I'm sure if it were flat I could hit 26-27 at 80mph.

past: 1980 240D Getrag, 1992 190E 2.3, 1993 400E, 1999 SL500
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post #8 of 12 (permalink) Old 08-04-2015, 07:56 PM
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I would think the 113 should be better on fuel due to the later technology in the design
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post #9 of 12 (permalink) Old 08-05-2015, 04:04 AM
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I would think the 113 should be better on fuel due to the later technology in the design
Although this comparison is a good way to start a discussion on engine performance differences, the only meaningful way to compare is to run a 119 powered SL500 against a 113 powered SL500.

I would think the gearing differences between a 430 W210 and a 500 R129, along with the weight differences would rule out a close comparison that you could draw any real conclusions from. These two cars are designed to accomplish different missions, a 4 door family sedan has a higher design need for better gas mileage by default.

My 94 E420 gets 27-28 mpg routinely around 70 on flat roads with cruise on. But it feels like it's rear end ratio is designed for the high speed cruises, where my 2000 SL500 feels much stronger when starting from a stop.

The topic of comparing these two engines is very interesting though, I'd like to see more of it, done between 129's. Most obvious comparison is a drag race, will a good running stock 98 SL500 beat a good running stock 99 SL500? I guess gas mileage might be interesting as well...


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Daily Drivers:
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Seasonal Daily Drivers:
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Seasonal Week-End Warriors:
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94 Pathfinder - "Old Rusty" sold
81-380SL-735 (Sold & exported to China)

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post #10 of 12 (permalink) Old 08-11-2015, 06:51 AM
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I babied our 1999 SL500 (purchased with 36k miles) for the 1st 6 years we owned it, and the MPG was always in the low 20s. Tune up maintenance always performed per schedule, so no issues with plugs, filters, oil changes (even even final drive ring gear).

This year, I started taking the car on 300 mile round trip drives (overnighter trips) with the wife (she owns a 2006 911 cabrio AWD 6 speed manual), since she wants the top down miles on my car, since it has set around unused more.

So the SL now has 52K miles (she has 53K miles on her car), and I'm getting 26-28 mpg now, loaded with small dog, luggage, top down (or up and AC on) for these jaunts. This is hilly country with 50% flat, 65-70 mph, north-south legs, temp in the 70s-100s.

Her car on the same trip gets around 25-26 mpg, although it weighs 750 lbs less, has a better drag ceof, a 3.6 liter engine, and a manual.

At 2000 rpm, I'm doing about 70 in the SL, and her car is probably 63 mph at 2000 in top gear.

Charlie
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