1st Generation Dodge Cummins 89-93 Discussion of 12 Valve 5.9 Liter Dodge Cummins Diesels with Rotary Injection Pumps

bad fuel milage

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Old 06-09-2011, 11:29 PM
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Hey guys I have a 92 W250 4x4 with 160,000 miles...I had the truck stock and was getting 20mpg, I recently put a 4inch lift on it and changed the tires size to a 35inch with 20inch rims...now my fuel milage is about 13mpg does this sound about right? Another question does anyone know the size of fuel tanks in these truck? Thanks for the help and comments....
 
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Old 06-10-2011, 02:53 AM
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fuel mileage is controlled by your right foot..... lift and bigger tires dont help either. Somewhere around 13 is about right from the information your giving. The fuel tank is 26 gallon i believe.
 
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Old 06-10-2011, 03:50 AM
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Haha yeah I hear you about the right foot...guess I didn't think lift and tires would cause such a loss in mpg....guess I will just have to deal with it...thanks
 
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Old 06-10-2011, 03:56 AM
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Putting any vehicle through anything it wasn't designed for causes problems and losses. Whats the fun in keeping anything stock though.
 
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Old 06-10-2011, 08:14 AM
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You just increased both surface friction with your tires, (and the friction coefficient of rubber is pretty darned high) as well as putting a brick-like object higher in the air, creating even more resistance. What did you think would happen? 13 mpg's sounds about right to me.

And our tanks are 30 gallons. Some say 26, some say 22, whatever. Every single fuel tank that came on a diesel powered 1st gen Dodge is 30 gallons. The gassers had a smaller capacity tank IIRC.
 
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Old 06-10-2011, 11:47 PM
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i lifted mine 2 inches in the front and 3 in the back and am riding on 35s now. i went from 21 to 17 mpgs. and i just dropped my tank to do a raptor pump and checked the capacity and its a 22 gallon tank
 
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Old 06-11-2011, 12:21 AM
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If you put a larger tire on the truck it will turn slower and put less miles on the odometer. Your truck may get 13MPG but its probably better then that with a slower rotating tire.
 
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Old 06-11-2011, 12:30 AM
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Originally Posted by KD93
You just increased both surface friction with your tires, (and the friction coefficient of rubber is pretty darned high) as well as putting a brick-like object higher in the air, creating even more resistance. What did you think would happen? 13 mpg's sounds about right to me.

And our tanks are 30 gallons. Some say 26, some say 22, whatever. Every single fuel tank that came on a diesel powered 1st gen Dodge is 30 gallons. The gassers had a smaller capacity tank IIRC.
wish I had a 30 gallon. Specs from dodge are 24 gallons on my 92 that is from the VIN and can not get more then 22 gallons in it a fill up
 
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Old 06-11-2011, 12:34 AM
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Every time my truck is on empty I have added 23 gallons. But I will say that there was at least 6-8 gallons left when it was on empty when I did my sump and had to drain the tank. It was 30 gallons easy...
 
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Old 06-11-2011, 01:03 AM
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I appreciate the info and feedback...I filled up today and calculated my mileage and I'm getting 15.5mpg ,guess I can't complain about that to much....think I just need to ease off my right foot a bit....thanks again guys!!!!
 


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