The Official Fuel Economy report thread

[redassag00]

23.94 MPG in rag doll, 500 mile old filters, and Rotella T, new front tires, pressure all at 33, post biocide treatment, this tank should hopefully be better sincethe car was EXTREMELY out of alignment. This mileage was strictly to and from work, no highway/long distance. Work commute is around 9 miles mostly 0-40 going home and on the way to work, several 20mph school zones.

[MBeige]

Anybody know what the optimal speed is to achieve best fuel efficiency? In the city I noticed 45mph is best, right around 2250rpm or 2500rpm where the torque is near peak. On that run I was able to do 26.7mpg!

I would think the highways would be best at around 65mph, or up to 75mph. Your thoughts?

[Boardmonger]

35 in town and 55 on the highway would deliver the best numbers. At 55 you could probably get 30 with little trouble, but who drives at 55 these days?

My last fill-up I got 23.5 with 25% highway and 75% city.

[84300DTurbo]

26.9 mpg on my last fillup about 80%/20% highway/city.
332miles driven.

hess diesel with a splash of power service...

[8D]

[redassag00]

24.885 MPG this week, all city driving, back and forth to work.

[84300DTurbo]

karugs - 1/5/2006 10:45 PM

Anybody know what the optimal speed is to achieve best fuel efficiency? In the city I noticed 45mph is best, right around 2250rpm or 2500rpm where the torque is near peak. On that run I was able to do 26.7mpg!

I would think the highways would be best at around 65mph, or up to 75mph. Your thoughts?

my feeling is i get better mileage on the highway doing 65mph and over...

i have not done any specific tests to confirm so it's just my guess...
at least with my engine it feels 'just right' at about 75..

[lkchris]

Recently ran E320CDI from Humboldt, AZ to Albuquerque.

from ~3500 ft asl to 7800 a couple times, ending at 5300.

425 miles

never saw a grade that caused cruise control to lose speed.

averaged 65 mph

34.5 mpg

[gdbmj]

Just quoting some spec's from a recent benz mag on fuel economy between gasser's and diesel,s
300D 87 bhp ,127 lb\ft , 0-60 17.8 sec and 25mpg ( from 10/81 27mpg)
280e 182 bhp ,177 lb\ft , 0-60 9.9 sec and 23mpg
Please dont shoot the messenger , not pro either diesel or gas , just figures.[:)]

[Boardmonger]

My brother is now driving the 83 300d turbo.

Today he filled up, drove 430 miles (95% highway at about 75) and put in 15.6 gallons, so a total of 27.5 miles to the gallon. He might be able to get that up to 29 if he drives easy.

[washerman]

noboby gets epa 25 city 33 hwy 123 is set at this rating 126 is set at 20 city 25 hwy this is less in ca due to more smog control junk dont recall diference small