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Author Topic: Poor Gas Mileage for Ford E450  (Read 4037 times)


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Poor Gas Mileage for Ford E450
« on: November 29, 2015, 07:56:31 PM »

I recently purchased a used 2007 Ford E450 shuttle bus that I intend to convert to a limo-style party bus for personal use.  Vehicle has a V-10 gas engine.  On my first gas fill up it appears I am getting around 5-7 mpg.  This seems low as I was expecting around 10.  I have read threads that state these shuttle buses are typically used for short distances and many times have high gear ratios in the rear end.  I have done some research but I can't find anything definitive regarding what the options are available to convert the differential gear ratio.  One post said the options are 4.10:1 to 5.30:1.  Not sure what I have but I will find out and post if necessary.  I am looking for more like 3.55:1 or 3.73:1.  Is this possible for this type of vehicle?

Thanks, Joe


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Re: Poor Gas Mileage for Ford E450
« Reply #1 on: November 29, 2015, 08:26:09 PM »
There should be a tag on one of the bolts on the differential housing.

If not:

Jack up a rear wheel. Make a mark on the tire and the ground in line. Make a mark on the driveshaft in line with a mark on the housing. Turn the wheel and count the revolutions on the drive shaft. You have to estimate the part of the last revolution of the shaft, but you can get close.
Jim And Darlene Wright
Full-timing with
Ryder, half poodle-- half garbage disposal
All in a
2007 Montana Mountaineer
2002 F250 Super duty 7.3 liter


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Re: Poor Gas Mileage for Ford E450
« Reply #2 on: November 30, 2015, 05:15:49 AM »
Those buses are geared for the expected weight they will haul. If you go to a 3.55 rear ratio which I don't think you will find for that housing you will lose a lot of pulling power and may not be able to satisfactory handle the weight you are planning on installing in the bus. That is a heavy duty rear which only offers a limited number of gear ratios.
2009 Bounder 36B, 2014 Honda CR-V, various grandchildren when school is out. KG4LHS
2014 Honda CRV Toad,
2014 Jeep Grand Cherokee Toad

Gary RV_Wizard

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Re: Poor Gas Mileage for Ford E450
« Reply #3 on: November 30, 2015, 06:20:40 AM »
I would not expect 10 mpg anyway. 7-8 is more likely, depending on the weight of your foot. If you try to make these large vehicles respond like your car or SUV, you will have your foot pressed to the floor every time you accelerate, and the mpg goes straight into the toilet.
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL


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Re: Poor Gas Mileage for Ford E450
« Reply #4 on: December 06, 2015, 07:13:13 PM »
1st take the VIN to any Ford dealer and they can tell you what rear end is in that beast 2nd 7-8 is probably correct 3rd if you want to change rear ends its not hard but its not cheap look to one of your local gear shops rather than a  Ford dealer it will be a lot cheaper with a core rebate
2015 Voltage 3305 Toy Hauler - loaded
2017 Ford Escape my Daily driver - first Ford in 25 yrs
2017 Black on Black F350 Diesel Dually loaded (First Ford Truck after 17 GMs) 5167lbs cargo/weight capacity -DRKHORZ

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Re: Poor Gas Mileage for Ford E450
« Reply #5 on: December 13, 2015, 10:35:16 AM »
Thanks for all the feedback.  Based on the cost and potential performance issues, I think I'll leave it as is.  I may reconsider when gas prices go back towards $4 a gallon