Loss of fuel mileage


Asked by Dec 30, 2015 at 08:18 PM about the 1999 Dodge Ram 1500 4 Dr Laramie SLT 4WD Extended Cab LB

Question type: Maintenance & Repair

My truck went from 12mpg to 8.7 I am not sure please help

4 Answers

Annesse Burris

Make sure all your filters are clean and clear, if you leave your truck idling for long periods of time it can contribute alot to bad mileage. Because it gunks up the fuel system. Sometimes it can be just as simple as an oil change though. It's surprising how bad a mileage you can get when your oils ready to be changed.

James Ramond

engine codes may tell something if the check engine is on, sensors that effect fuel delivery can deify the reason they were there from the start,, check the air filter for free flow, also, change fuel brand

Juan Manuel Verduzco

Do you mean from 12mpg to 8.7mpg..... Or to 8.7 l as in liters...... Could be you changed the units from imperial to metric. Just reset them to imperial checking in owners manual.


12mpg to 8.7 mpg do you think it could be a vacume leak it runs a little ruogh

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