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#1
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Real-World fuel mileage
As promised:
Car is 1983 300CD. Fresh oil change with 15W-40 AMSOIL. Fresh valve adjustment. Fresh air filter and fuel filters. Starting miles: 290788. Ending miles: 293341 Total miles driven this trip: 2553 Trip route: Leg 1: Near Richmond VA to Tampa, FL via U.S. 1 to U.S. 301 (no interstate hwys) Leg 2: Tampa to Ft. Lauderdale. No interstate hwys Car parked in Ft. Lauderdale for 5 days. Leg 3: Ft Lauderdale to Charleston, SC. No interstate. Leg 4: Charleston SC. to Home. Interstates all the way at speed limit (65 to 70 mph). Air conditioning most of the way, cruise control used where feasible. Ran speed limit. Did not avoid small towns. Fueled 10 times (kept at 1/2 full). Threw out the high mileage and the low mileage and averaging the rest provided a real world mileage of 29.456. |
#2
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why would you throw out any mileage?
I'd total the miles, and total the gallons, and that would be my mileage for the trip.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#3
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I did 63mph on a 2 hour trip and got 32mpg.
What color is your CD? I saw a white one in town a few days ago (charleston)
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Current : 1988 R107 560SL Previous: W123's, W211, w210 E55, W463's, W108's, W111 |
#4
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Keep in mind that tire size affects "indicated" speed and miles. So as your tires wear (get smaller), your speedometer and odometer will err on the high side. This is most notable right before and after you get new tires. So basically, if you are using your odometer to measure miles traveled, it is likely an overestimate if your tires are worn. This is one of the reasons some here suggest using GPS to accurately determine miles traveled in mpg calcs.
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1968 220D, w115, /8, OM615, Automatic transmission. My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear). |
#5
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Quote:
I thought you went to the Black Hills of South Dakota? Say hello to Nancy. Seriously, that is a great mpg figure!
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Ben 1987 190d 2.5Turbo |
#6
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I refrain from posting mileage results generally, as I seem to pull down mileage results that might result in me being tarred and feathered by the community. That said, the '83 turbo drivetrain in my '77 300D prior to my 4-speed conversion was accomplishing 29 MPG consistently with about 25/75 city/highway. Odometer verified with GPS.
I figured I would just keep my mouth shut and enjoy it. I am hoping that the 4-speed conversion will bump up the fuel mileage a little. If you will excuse me, I need to go spray myself with WD-40, so that the tar and feathers won't adhere as well.
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- K.C.Adams '77 300D Euro Delivery OM617 turbo / 4-speed swap 404 Milanbraun Metallic / 134 Dattel MB-Tex Current status: * Undergoing body work My '77 300D progress thread |
#7
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I drive 80+ in my wagon which is probably in need of a valve adjustment and the new nozzles I have on my work bench... Toll roads for 12 miles/day and a mile or so of stop light traffic.
I get about 20mpg. Right foot is HEAVY.
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'85 300TD "Puff The Magic Wagon" - Rolling Resto '19 Mazda CX-9 Signature - Wife's sled '21 Morgan 3-Wheeler P101 Edition '95 E300d - SOLD '84 300TD "Brown Betty" - Miss this one '81 240D "China Baby" - Farm grocery getter |
#8
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responses
vstech: High mileage was unrealistically high and low was unrealistically low. May have had to do with fuel fill but tossing out high and low when averaging is a common statistical technique.
shorts: tires are about middle-aged but in any case, I think the difference would be within margain of error. |
#9
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You need to at least check your odometer against mile markers or GPS. My odometer reads 10% high even though the speedometer is spot on. I have to multiply my indicated mpg by .91 to get true mpg.
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Current Stable
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#10
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Quote:
Its called removing outliers. An outlier is a value that is more than 1 1/2 X IQR from the nearest other data point. You may have over done it a bit. At least you made the effort to use figures over a long distance. There are way too many on here who quote numbers from topping up their tank after a few short trips.
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Grumpy Old Diesel Owners Club group I no longer question authority, I annoy authority. More effect, less effort.... 1967 230-6 auto parts car. rust bucket. 1980 300D now parts car 800k miles 1984 300D 500k miles 1987 250td 160k miles English import 2001 jeep turbo diesel 130k miles 1998 jeep tdi ~ followed me home. Needs a turbo. 1968 Ford F750 truck. 6-354 diesel conversion. Other toys ~J.D.,Cat & GM ~ mainly earth moving |
#11
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Well, it's almost exactly 200 miles from my home in Alexandria to my parent's home in Virginia Beach. My 5-speed NA 84 TD has an incorrect replacment speedometer for a turbo model. So, using the interstate mile-markers to calculate the correction-factor, on my last trip I got around 30 mpg highway, with the AC going, at an average 65 mph. This includes the few miles in local traffic when I left Alexandria and just before I arrived in Virginia Beach.
I'm hoping to make the same trip next week and retest, hopefully without needing the AC this time, as it needs a new LP hose and freon now, and after some brake work, since lately my front brakes have been dragging. Unlike the typical eBay W123 peddler claiming 40+ mpg, 30 is not an outrageous figure for these cars. Happy Motoring, Mark
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DrDKW |
#12
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Quote:
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IN general about mpg here: Call me skeptical, or trying to keep it real, but after 5+ years here, I routinely read claims of 41 to 44 mpg @ 65 mph with my identical '99 E300TD diesel car auto here on DD. It is a physical impossibility to get 44 mpg out of a car that will not get out of the LOW 30s, unless it is covering those miles being pushed or towed with it's engine off. I get my hip waders out when I read mpg claims that a like car will physically return beyond 32 mpg under any real world conditions. If my car and an exact like car were to be able to return ANY better mpg @ 60 to 70 mph than 32 mpg, ithey would have already done so in 14-years, AND 130K miles since buying it new. Last edited by Skid Row Joe; 04-28-2013 at 01:24 AM. |
#13
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75 MPH on the highway.
Sorry if I don't immediately believe you. Is anybody else getting even HALF that?
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1982 300CD Petrol/Black Leather |
#14
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highest and normal on a trip
My highest one time was 34, but I had 8 quarts atf in the tank.Normally I add one bottle of Marvel Mystery oil to a tank,and average 32.I do it to keep IP lubed up.
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1999 w140, quit voting to old, and to old to fight, a god damned veteran |
#15
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When you had 8 quarts of ATF did you add two gallons to your fuel quantity before calculating?
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
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