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As a daily highway vehicle, my E550 Coupe does incredible mpg, well beyond what I thought a 4.7L TT should be capable of. Wanted to check in with others and see if you all have similar experience. Photos are from my morning commute in Chicago today
Commute is 24-27 miles depending on what route I take. Averaging 31 mpg
After nearly 4K miles averaging 24 mpg with city driving included.
That's really impressive for a V8, especially city/hwy driving in Chicagoland. What's your percentage of Hwy/City? My V6 TT avgs 18-21 city, while hwy is about 31-33. I'm about 90% city, mostly short trips.
I really don’t do anything other than watch the instant mpg meter once I’m at cruising speed on the highway. I try to keep my foot giving enough gas to maintain speed without it being a burst of gas so I do try and keep the meter on higher mpg side.
I use AC and Heat as weather calls for it usually keeping temp at 70-72 deg F. I always keep a comfortable temp but I don’t blast the air.
My tires are inflated at right level and are the Michelin Primacy which do need to be changed next season. Not sure yet what I’ll change to although most in the forum go with Michelin Pilot Sport.
My engine air filters have been in the car since spring of last year so plan to change them in the spring. I doubt they are dirty given the mpg.
I have noticed two cruising speeds get excellent mpg, 45 mph and 70 mph. When I’m in between those two numbers or above or below the mpg doesn’t seem to be as good.
That's really impressive for a V8, especially city/hwy driving in Chicagoland. What's your percentage of Hwy/City? My V6 TT avgs 18-21 city, while hwy is about 31-33. I'm about 90% city, mostly short trips.
All short trips (less than 5 miles)..3 times/week.
A/C blasts constantly (Florida)...I never turn it off.
93 octane Shell fuel
One minute warm up every start.
I rarely exceed 30mph.
60K miles on the car.
2013 E350 coupe.
best,
Mark
ps. I know that short trips are tough on the car, so I change all fluids every 6 months ( or 1500 miles). Probably overkill. Oh well.
I don't use the car to compute mpg, I don't trust the calc. I use the odometer and gas added over time. Mpg is 17. 2016 E550 Coupe
I'm running ~54% Ethanol, which burns a lot more fuel per mile. I made an Excel sheet to calc how much alcohol to add per fill, what % alcohol it actually ends up being, and mileage per fill.
I'm either city or 80+mph so never ideal for mpg. I warm the car up for 10min in the am because I hate the cold. Tires are under inflated and I drive it pretty hard.
I don't use the car to compute mpg, I don't trust the calc. I use the odometer and gas added over time. Mpg is 17. 2016 E550 Coupe
I'm running ~54% Ethanol, which burns a lot more fuel per mile. I made an Excel sheet to calc how much alcohol to add per fill, what % alcohol it actually ends up being, and mileage per fill.
I'm either city or 80+mph so never ideal for mpg. I warm the car up for 10min in the am because I hate the cold. Tires are under inflated and I drive it pretty hard.
@Chevota you are a mad scientist concocting the most potent fuel potion! 😂 did you ever measure your 0-60 mph or quarter mile?
The Ethanol doesn't help power that much. I think if someone put gas back in it, and dialed in for gas again, without me knowing, I'm not sure I'd notice.
I kinda did a 1/4 mile, with my Dragy. Kinda meaning I wasn't trying to so I let off the gas just before the 10 sec mark, so I was decelerating from that point on. The Dragy actually recorded it so it's all I have. It read 12.19 @ 107.7. I can only guess what it could've been. If I hadn't let off 12.0 sec nets me 120. Based that alone I think it's worth at least 12.0?
My biggest issue is 0-60, which is usually 4.5, sometimes as low as 4.3. I just can't hook up to do any better.
Impressive!
I get about 21 mpg...
All short trips (less than 5 miles)..3 times/week...
All things considered, 21 mpg is actually pretty good if most of your driving is short trips. The only way my city mileage gets above 21 is if my trip avg is more than 5 miles.
It was easy to achieve 29-31 when I first got my E550. After the tune, I am getting 25-27 highway. Still very impressive. Didn't buy it for fuel economy but am pleasantly surprised!
Update: I mentioned I don't use the car/dash to tell me mpg because I don't believe it. I've never seen one that was accurate. So, thanks to this thread, I decided to check mine the past week and it reads 23 to 25mpg every time.
Actual ~17 since I've been monitoring it (16.52 to 17.78 are the extremes). Trips average ~25 miles and usually most is freeway.
The gauge on the dash that gives instantaneous mpg (horizontal bar) usually hovers between 20 and >30. It seems to more or less avg ~24.
I had assumed it based this claimed mpg on injector pulse width, # of cycles, pressure, and the other injector stuff that goes on, because why wouldn't it? Well, maybe the math was too difficult, I dunno.
Instead, it seems to base it on Lambda, load and rpm. That would explain perfectly why it shows normal mpg for me. It may also explain why people with a tune might see a drop in mpg, but I doubt they actually lost any.
The moral of the story is I would check actual mpg over time and compare it to that gauge to see if they match. I'm sure they're roughly accurate, much closer than mine for sure, but you won't know until you check.
Thanks I’ll check using miles. I’ve done the math a couple of times based on miles between fill ups and gallons replaced. From what I recall it was accurate. I have everything stock.
It would take me a month or more to accumulate 200 miles..so I calculated my own fuel economy ( utilizing my useless undergraduate mathematic degree from an Ivy League school).
20.7 mpg. I think.
Best,
Mark
ps my last vehicle (2005 MINI Cooper s) got about the same.
Yikes! My '95 Range Rover Classic gets that kind of mileage...Do you just do short trips under 5 miles or are you just in bumper-to-bumper traffic or both?
Yikes! My '95 Range Rover Classic gets that kind of mileage...Do you just do short trips under 5 miles or are you just in bumper-to-bumper traffic or both?
Early today I was able to properly scroll through my mpg setting.... though I don't know how I came upon this setting??
but the miles traveled are nearly exactly how many miles I've had the pleasure of driving the sweet car ( only about 100 miles/month..I guess, owned 15 months). And this is my only car!!...haha. I need to get out more.
Early today I was able to properly scroll through my mpg setting.... though I don't know how I came upon this setting??
but the miles traveled are nearly exactly how many miles I've had the pleasure of driving the sweet car ( only about 100 miles/month..I guess, owned 15 months). And this is my only car!!...haha. I need to get out more.
That's really good avg mileage considering you do short trips and don't drive much! I always reset my trip odometers with each fill-up. I manually reset the current trip w/ each drive, but as it's been said before, the avg numbers are somewhat suspect. I should probably calculate it manually after the next fill up...
SLK320 Low 20’s City; Mid to high 20’s highway. 31mpg all time best(100,000 miles driven).
SLK63 High teens city; Low 20’s highway. 28mpg all time best(4,000 miles driven).
11-03-2023, 08:05 AM
