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Old 01-26-2014, 09:59 PM   #1
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Mileage or Range

Need some advice here again. Trying to calculate roughly the range or mileage for a 1996 40ft Allegro it holds 150 gals of diesel and has the 8.3 Cummins with turbo. Just a good average estimate would do first time owners here and trying to plan for some trips. Thanks again guys.
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Old 01-26-2014, 10:09 PM   #2
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You might get more, but I wouldn't plan for over 800 max. And maybe less. You will just have to drive it and see. Watch fuel gauge and set trip set every time you fill and after awhile you will get a feel for it. I never like to go below a quarter of tank as the geny won't run they say. But I've been right there and it would still run. Probably about 5 to 6 hundred miles will be a nice comfortable range for you.
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Old 01-26-2014, 10:10 PM   #3
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We have an 8.3 Cummins ISC with turbo also. I think your engine is the older mechanical one while ours is electronic. We usually get 7.5 mpg traveling about 1650 RPM which is about 65mph. So to more directly answer your question I think you could safely plan on 6.5mpg for refueling stops and that would give you some cushion.
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Old 01-26-2014, 10:12 PM   #4
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Originally Posted by safehaven View Post
Need some advice here again. Trying to calculate roughly the range or mileage for a 1996 40ft Allegro it holds 150 gals of diesel and has the 8.3 Cummins with turbo. Just a good average estimate would do first time owners here and trying to plan for some trips. Thanks again guys.
Not sure this will help you but I also have the 8.3 cummins on a 36' bus chassis. Average about 35000 lbs. I carry 110 gallons of fuel, I drive right at 55mph and make sure my tires are pretty well aired up. I drove from Southern California to Napa last summer which was approx a 1000 mile round trip. I used a little over 1/2 tank, I hit stop and go traffic an hour before I arrived home which really killed my mileage.
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Old 01-27-2014, 05:49 AM   #5
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Thanks gents, it is the older mechanical fuel injection model. I sure appreciate you guys helping out. Did not get any of this info from previous owner so this is very helpful. I imagine towing a vehicle would substantially cut into this number. So if I am reading this right unloaded or lightly loaded about 900-1000 miles to a tank towing less. Should I cut say 25% for towing a vehicle? Thanks again very appreciated input.
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Old 01-27-2014, 07:36 AM   #6
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With a 150 gallon tank, your range will easily be somewhere between 1000 and 1200 miles per tank (to empty). I generally plan my fuel stops for somewhere around a half tank, or 500 to 600 miles. That's generally every other day for us when in travel mode.

Hauling extra weight may affect mileage, but no where near 25% for a big rig. Some will tell you they notice no difference solo vs pulling the toad, I suppose it depends on the terrain. Pulling across the plains of Kansas, perhaps, but up the side of the Rockys, you'd probably see some difference.

It's not a real good comparison, as our engine is several generations removed from yours, but is roughly the same size. I plan on 7mpg when traveling, and that's with our 4500 lb toad behind us. Mountains will pull that down a bit - flat terrain, no head wind, can get us close to 8, but overall we'll end up somewhere near 7.
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Old 01-27-2014, 09:22 AM   #7
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It's nice knowing what the range is that you can travel with the fuel on board. But when I travel I use Gasbuddy App & Pilot/flying J app to check prices. There is no way I am going to travel 800 miles with out a stop. So I correlate my stops with fuel stops. Unless the area where I need to stop to eat, just get out & walk for a few minutes, ect is extremely high priced, I will fill up anywhere between 2/3 full to 1/3 empty. If you are driving a diesel you certainly do to want to get the fuel level below 1/4 tank then try to start the genny or have it run out of fuel. If you starve the genny for fuel you will need to bleed the fuel system before it will start again.
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Old 01-27-2014, 09:35 AM   #8
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7-10 mpg will get you in the ball park to start. THere's a lot of wild claims out there, but keep a notebook and do the calculations by hand until you find what YOU actually get. Other issues are that you may not be full when you get a full indication on the dash. Can be caused by many issues, but kinked or up-sloping vent lines can be a cause there. Also, be sure to call Tiffin and verify that you have a 150 gal tank. I could be wrong, but I thought they were only putting in 100 gal tanks on the older coaches. A call to Tiffin with the VIN will give you the answer for sure.

Drive in the top half of the tank until you get your gauge and mileage all figured out. Then you can start pushing the limits on range and mileage. We did that with all our coaches and are now confident in the system so we can put 135 gal in the tank and we don't panic when the low fuel light comes on.

Good luck with the coach.
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Old 01-27-2014, 03:08 PM   #9
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Originally Posted by safehaven View Post
Need some advice here again. Trying to calculate roughly the range or mileage for a 1996 40ft Allegro it holds 150 gals of diesel and has the 8.3 Cummins with turbo. Just a good average estimate would do first time owners here and trying to plan for some trips. Thanks again guys.
We used to have a 1996 Allegro Bus 40'. I am looking in my book to see what we did. 937 miles 107.137 gal. 1034 miles 120 gal. 1119.6 miles 126.424 gal. 942.7 miles 115.927 gal. 858.8 miles 107.933 gal. Hope this helps.
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Old 01-27-2014, 09:49 PM   #10
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Thanks guys all very helpful to a couple of greenhorns. I got the 150 Gal number from the Tiffin sticker inside the MH which has model, weights etc. Looked kind of official. Again many thanks to you all, I have a lot to learn and appreciate all help and advice.
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Old 01-27-2014, 10:09 PM   #11
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Maybe I should have gotten an older bus. 7-10 mpg in my dreams maybe.
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Old 01-27-2014, 10:14 PM   #12
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Originally Posted by bobioknight View Post
Not sure this will help you but I also have the 8.3 cummins on a 36' bus chassis. Average about 35000 lbs. I carry 110 gallons of fuel, I drive right at 55mph and make sure my tires are pretty well aired up. I drove from Southern California to Napa last summer which was approx a 1000 mile round trip. I used a little over 1/2 tank, I hit stop and go traffic an hour before I arrived home which really killed my mileage.
I am very jealous I can barely get that kind of mileage out of my 3/4 ton diesel pickup with a 6 speed Allison. If I am on interstate driving 65 mph I can get 20.5 out of my pickup. You are getting 18.5 mpg out of a 36000 pound bus. I realize 55 mph versus 65mph gets better fuel mileage but it only makes a couple of mpg difference in my truck. That is running my truck empty not towing anything and with two passengers.
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Old 01-28-2014, 09:40 AM   #13
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bob your fuel gage is broke... I have a hard time grasping the fact that you got mid teens for MPG. sorry just my 2cents
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Old 01-28-2014, 01:07 PM   #14
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Generally, calculating range is fairly easy.. Manufacturers design for about a 400 mile range, that is 8 hours at 50 mph average.

And in the case of a motor home that should leave you with about 1/4 tank, Just enough to fire up the generator for a few minutes.

By the way.. When I ran the math on my gasser.. Dead on 400 miles from FULL to 1/4 tank.
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