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  #1  
Old 04-22-2015, 08:21 AM
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Bad fuel economy

I just bought my 2007 WK limited with the 5.7 and am not liking the fuel economy that I am getting. I have driven it for almost a week(95% interstate, 5% city streets) and according to the EVIC I am averaging 14.5 MPG. That doesn't sound right to me. That is worse than what I was getting in my 2001 JGC with the 4.7. I figured with the MDS i should be a lot closer to 20 MPG. Does anyone have any suggestions as to what I can do to improve this number?

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  #2  
Old 04-22-2015, 08:28 PM
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Re: Bad fuel economy

whats your driving habits like? i have the 3.7 laredo and 80% high way and not letting the rpms go above 2100 and i get 22 MPG. Also with the EVIC I've noticed that if you reset the counter while on the highway doing 55-60 you have a better chance of raising your total MPGs.
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Old 04-22-2015, 09:53 PM
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Re: Bad fuel economy

Since this ia a "new to you" vehicle, have you verified/insured that all the service requirements are current and the correct spark plugs and oil are in it? If not, that should be the first order of business. The engine is sensitive to the type of spark plug installed and the MDS either won't work or won't work correctly if the wrong weight oil has benn put in. Must be 5W-20, with (in many 5.7 owners' opinions) a good synthetic working better than dino. oil. Beyond that for now, check the tire pressure and look at tread wear for signs of alignment issues. Also, at some point soon, you should insure that the transmission service is current. If you can't verify that it has been serviced within the last 30-60K, IMO servicing it would be pretty high on my list.

Approximate fuel economy (using the proper grade top tier fuel) for a stock, well maintained 5.7 WK should be ~12-14 mpg in town, ~14-16 mpg mixed, and ~16-18 mpg on the highway. Your mileage, depending on driving style, amount of stop and go, etc. may vary. Remember, these things weigh in excess of 4700 lbs. and everytime you have to get it moving from a stop, kills the economy a bit.

One more thing, the EVIC readout is seldom correct. Figure your FE with a calculator.
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Old 01-15-2016, 09:26 AM
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Re: Bad fuel economy

Run 89 or better octane gas replace stock air filter with high flow k &n you don't have to buy the whole kit just buy air filter,make sure plugs are good
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Old 01-17-2016, 04:23 PM
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Re: Bad fuel economy

As another person noted, the way you drive can have a large impact on fuel economy. Tires and alignment are also important. This was just asked on another forum and I recommended reading this article about fuel economy on my site.
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Old 01-17-2016, 04:53 PM
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Re: Bad fuel economy

Quote:
Originally Posted by tukes23 View Post
I just bought my 2007 WK limited with the 5.7 and am not liking the fuel economy that I am getting. I have driven it for almost a week(95% interstate, 5% city streets) and according to the EVIC I am averaging 14.5 MPG. That doesn't sound right to me. That is worse than what I was getting in my 2001 JGC with the 4.7. I figured with the MDS i should be a lot closer to 20 MPG. Does anyone have any suggestions as to what I can do to improve this number?
Also were you buy gas ,use a place that has a good turn over not a place that buys it in bulk..normally bulk gas is old...
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Old 02-12-2016, 03:19 PM
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Re: Bad fuel economy

Quote:
Originally Posted by dallas1 View Post
Run 89 or better octane gas replace stock air filter with high flow k &n you don't have to buy the whole kit just buy air filter,make sure plugs are good

I run 87 Octane and get 21 mpg HWY; Octane rating has essentially nothing to do with mpg on these motors. I would also never recommend a K & N. They are by far the worst at filtering out particles, as many tests have proven, allowing the largest particles to pass than any other filter. I am a microscope dealer (optical to confocal to atomic level) and have compared their media to stock media under high magnification and the difference is huge. The large pore sizes allow large particulates to pass through which end up in your engine, where OEM and others will filter them out. I replace the panel filter every oil change with a Fram Xtraguard, only 10 bucks.
Need to know the mileage, history of maintenence, but suggestions are clean the throttle body, reset the ECU, and put seafoam in the gas and oil (then change oil after 100 miles). IF you have 60k or more and the above has not been done, it will drive much better and get better mpg.
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