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Old 07-07-2020, 05:06 PM   #1
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Please be kind.lol

I know there are so may variables that make this question impossible to pin point. and Ive read several ads claiming unbelievable boasts. but here it goes.... I am pretty sure I will be purchaseing a '99 37' allegro bus with a 330 hp CAT engine and a 6 speed Alison tranny. ....Bare bone empty what kinda fuel milage might I be able to get? .. I am really sorry to even put this question out there.
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Old 07-07-2020, 05:23 PM   #2
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I have a 2005 Gulfstream 36' cat 350 C7 7.5 mpg & almost always towing enclosed trailer, I do believe you'll have an older version of the C7, 3206? Or something like that, the numbers escape me right now, oh, I do love the Mp8 tho
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Old 07-07-2020, 05:36 PM   #3
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I have a 2005 Gulfstream 36' cat 350 C7 7.5 mpg & almost always towing enclosed trailer, I do believe you'll have an older version of the C7, 3206? Or something like that, the numbers escape me right now, oh, I do love the Mp8 tho
This MP8?
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Old 07-07-2020, 05:37 PM   #4
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Originally Posted by Steve,N,Jan View Post
I know there are so may variables that make this question impossible to pin point. and Ive read several ads claiming unbelievable boasts. but here it goes.... I am pretty sure I will be purchaseing a '99 37' allegro bus with a 330 hp CAT engine and a 6 speed Alison tranny. ....Bare bone empty what kinda fuel milage might I be able to get? .. I am really sorry to even put this question out there.
I would expect 7-8 unloaded or with a light load.
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Old 07-07-2020, 06:20 PM   #5
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Thanks thats what I was figuring. these people putting 14 mpg stuff is crazy. I drive a concrete truck for a living and working all day we get 2.5 to 3.5 I hoped not working with THAT big of loads it would get more but wondered about how much
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Old 07-07-2020, 06:31 PM   #6
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When you get a chance , to look at the engine valve cover I believe you'll find a decal giving your engine type and power rating .

This should confirm that you have a 3126B Cat engine . the 330 HP version .
These two files should help you understand the fuel system and engine .
Also info from Cat , on getting the best fuel economy out of your RV.
Safe travels.
Attached Files
File Type: pdf 3126B Heui Engines.pdf (168.7 KB, 2 views)
File Type: pdf 3126B specs.pdf (113.9 KB, 2 views)
File Type: pdf Cat_RV_Performance.pdf (246.3 KB, 3 views)
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Old 07-07-2020, 07:20 PM   #7
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This has been an oft ad,Ed question. It seem the average mpg comes in between 6.5 and 8. There are a few exceptions but not many.
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Old 07-07-2020, 08:04 PM   #8
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8 mpg
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Old 07-07-2020, 08:20 PM   #9
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My best guess is your engine is 3126B 275 or 300 horse not a 330 horse and it will get between 7 and 10 mpg depending on the load, road conditions ,and how fast you drive.Ive had two of those cats and they are good engines .
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Old 07-08-2020, 03:52 AM   #10
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Tanks everyone Ill get a pic of valve cover saturday
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Old 07-08-2020, 09:46 AM   #11
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2002 Allegro Bus with Cat 3126 330 hp. Right at 8 mpg on average.
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