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Old 08-24-2016, 10:26 PM   #11
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All I know is I've read that numerous semis have this engine and get 10-12 mpg at 2200-2600 rpm according to some other diesel forums. Are busses that much different than a loaded semi? I've read plenty of people getting 10 mpg with a DT466 at AT545 so I thought I'd get as good or maybe even better with my lockup trans idk
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Old 08-24-2016, 11:19 PM   #12
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even the appalachains , poconos, and smokies arent bad.. i just have a DT-360 with AT545 and 4.78 gears.. theres only 1 or 2 hills that I have slowed below 55 on.. and I figure ive got a lot less power at my wheels than you do having a 466 and an MT643..

ive got 11R22.5 tires now.. whats wierd is im getting that 9-11 MPG range running at 60 on the highway.. I dropped sigificantly when I ran my bus at its top speed of 65-68.. like in that 6-8 category...


-Christopher
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Old 08-24-2016, 11:31 PM   #13
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I will just set this here...

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Old 08-24-2016, 11:33 PM   #14
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Originally Posted by cadillackid View Post
even the appalachains , poconos, and smokies arent bad.. i just have a DT-360 with AT545 and 4.78 gears.. theres only 1 or 2 hills that I have slowed below 55 on.. and I figure ive got a lot less power at my wheels than you do having a 466 and an MT643..

ive got 11R22.5 tires now.. whats wierd is im getting that 9-11 MPG range running at 60 on the highway.. I dropped sigificantly when I ran my bus at its top speed of 65-68.. like in that 6-8 category...


-Christopher

That's the range I am expecting with mine. I don't think it's out of range at all. Something has to be wrong
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Old 08-24-2016, 11:35 PM   #15
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I will just set this here...


I've actually seen this thing before haha
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Old 08-24-2016, 11:47 PM   #16
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Are you sure your speedometer/odometer are correct? Changing tire sizes can throw it off. How are you calculating the miles driven?

Aaron mentioned injectors ... old/worn/bad injectors can hurt fuel mileage, so you might want to check into that, if you haven't already. Mechanical injector pumps can as well. One old farmer I worked for had a couple F-350 trucks with 7.3 engines and one of them would consume ~40 gallons of fuel on a 200 mile trip. The other did somewhat better, averaging ~25 gallons on the same 200 mile trip. These were typical 16 foot box trucks, which should have been able to manage better than 10 MPG with these engines ... the fuel systems had a lot of miles and presumably never replaced, AFAIK.
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Old 08-25-2016, 10:20 AM   #17
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omne thing I hadnt thought of is injector timing is Crucial to MPG's.. I dont know how the 'E' variants of the engines handle it.. i know on the mechanical pumps it is easy to remove the inspection cover and check what the injector timing is set at...

imjector timing on a diesel is effective to the spark timing on a gasoline engine.. and greatly affects power output and burn quality in the cylinders..

-Christopher
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Old 08-25-2016, 10:22 AM   #18
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omne thing I hadnt thought of is injector timing is Crucial to MPG's.. I dont know how the 'E' variants of the engines handle it.. i know on the mechanical pumps it is easy to remove the inspection cover and check what the injector timing is set at...

imjector timing on a diesel is effective to the spark timing on a gasoline engine.. and greatly affects power output and burn quality in the cylinders..

-Christopher

If the timing was incorrect would I have any side affects? The rig seems to have power to spare but I've also never driven any other buses
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Old 09-01-2016, 02:08 PM   #19
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So from what I've gathered online, it seems like most DT466 users are getting roughly 9-12 mpg. Mine is still only getting 7.5-8, doesn't seem like the foot or towing the toad is making a difference at all.

My trip this past weekend was 600 miles, just myself and 3 guys. Not a ton of gear at all. I kept it at 60 the way there (2350 rpm), and noticed that I was getting pretty poor mileage. So on the way home decided to slow down to 55 (2200 rpm), and still only got 7.75 mpg.

A few things I haven't checked, tire pressure and fuel filter. But could either of these things really be hurting me this much?

The drive had hills, some of which required the pedal to the metal, but not too many more hills than I would expect a normal trip would have. Idk. What do you guys think

We have a 7.3 deisel and was having bad gas milage. A trucker at a truck stop told us to put some Lucas Deisel Treament in it to clean injectors,etc..
It not only had better milage but also ran better.

Far as hills go our Shorty really hates hills, it slows down on the long high ones to 35mph, which is bad and maybe against the law? .

Wife of International
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Old 09-01-2016, 02:34 PM   #20
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my bus has always been a 7-9mpg bus. i drive with the foot to the floor all the time. that gets 60-67mph.

on my first trip this summer, i caravan-ed with another skoolie, at about 5mph slower than foot to the floor. 55-60

i didnt get to check my fuel mileage, but the needle never moved off of full for the 2 hours or so that we drove together. after they turned off, i sped up and the gauge started moving like usual.
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