MPG for non 2 cycle powered bus

[JohnEd]

There is currently a post asking for MPG of 2 cycles.  How about the rest of you with Cummins, Cat and DD 4 cycles?  With current fuel prices a re-power is making more sense from a $ standpoint.

Thanks,

John

[skipn]

cummins L10 ~9mpg @60 to 65mph probably a shade less if I used a calculator instead of pencil and paper

cat 3306  ~0.89 gals per acre at 90% throttle 1.1 gals per acre at full throttle at 16 hours a day it made a difference

              my mileage would probably drop off big time if I did the 70 to 75 MPH. Something to do with physics I'm told


YMMV

Skip

[Jerrry@nc]

On my trip back from Fla with my new Series 50  world 6 speed and 4/11 rearend I got 9.1 avg for 620 miles

[Blacksheep]

Was recently visiting a fellow busnut and was told that on some prevost xl's that started life as a seated coach and have twin air inlets that one of the inlets could have been closed off to help eliminate noise into the seated area. This cut down his mileage drastically so it would do anyone good to check for proper air flow especially if you have 2 air inlets. Mine only has 1 and my data reader lies about MPG. It says 7.9 on our last outing running 68-70 mph.

[JohnEd]

Blacksheep,

Very good info on the Pre.  Thanks for that.  What engine are you running?

Thank you for your post,

John

[Blacksheep]

John I'm running a good ole 8v92 and 740 trans kept alive via a ddec II. Runs great now that my electrical issues are gone and running it recently showed I had power to spare!
BS

[JohnEd]

BS,

There are a lot out there that are getting great MPG from the 2 cycles.  I don't imagine anyone has enuf breath to talk you into a repower....and they shouldn't.  The guys facing a major repower need first hand info to make a good decision and that means both sides and a variety of choices.  I would be very happy with an 8V92 that gave me 7.9 through an auto.  I may want to visit and take a lot of detailed measurements.


Thanks,

John

[GM0406]

Is it possible that a large engine instead of a smaller one will generate better fuel mileage in these coachs?  It seems that this could be the case.  I still have to verify the fuel mileage on my 8V71 TA with a V730 in a 4106 running N-65 injectors.  Pretty standard conversion and whatever gears it has, it will run up to 80 mph easily and over that if you aren't careful.  I have to install a cruise control on this unit to keep it at 65.  Problem is that the speedo is so far down there, and I am always looking straight ahead.  I check gauges of course, but not often enough to keep this think at 65.  It just wants to roll with the air throttle, and unlike the '04, I don't have to vary the throttle much to have it climb on it's own.  And it runs so smooth, that you don't notice it.  Kind of like my old Citroen here which also needs a cruise control.  So I have two to install.  Believe it or not, the '04 has a cruise control on it!  The Silver Sides for sale here locally has a cruise control also and it is a latch that holds the accerator down.  Look out!!!  Bill T.

[edroelle]

Series 60, B500, 49,000 pounds including toad

About 7.8 miles per gallon at 60 MPH.

Ed Roelle
Flint, MI

[skipn]

Bill T.

  The bigger the engine the more fuel (in stock configurations) the biggest exception is electronic controlled
VS. mechanical controls. Then the equations are different. apples <> Oranges

If I had a stock L10E vs my L10 I could get better feul milage but I would probably up the HP from the
electronic side and be back where I am now

  FWIW

Skip

[mikelutestanski]

hello     MPG  and performance issues.
    Dont  forget the problem of weight.   All things considered weight has to be a factor to consider.  Coaches weighing in at 34000 and 40000 and 50000 pounds will all have fuel penalties to take into account as well as performance issues going up/down hills etc..
     Remember no free lunch.   
           Happy bussin   mike

[belfert]

As far as big engine versus small engine goes, a bigger engine sometimes getter better MPG.  The previous generation Dodge Dakota crew cab would get better mileage with the 4.7L V8 than the V6.  The V6 was struggling to handle the larger crew cab vehicle.

I often wonder if I had the 400 HP S60 with 12.7L instead of the 11.1L if I would get better MPG.  The Dina owners with the bigger engine report another MPG or two over mine.  It would never, ever pay in fuel savings to do the swap.