V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

Poor gas mileage on HIGHWAY

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Old 11-14-2007, 05:38 PM
  #11  
SilvrStang
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Default RE: Poor gas mileage on HIGHWAY

Ever heard of regular car maintance and a tune up?
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Old 11-14-2007, 08:51 PM
  #12  
mustangred
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Default RE: Poor gas mileage on HIGHWAY

On a full tank my car gets around 250 when the low fuel light comes on that is with city/highway But one time on a long trip I was on the interstate I was getting around 200 miles on half a tank.
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Old 11-14-2007, 10:32 PM
  #13  
jpacetti
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Default RE: Poor gas mileage on HIGHWAY

I used to get 27.5 on the highway 15 around town till I changed my head gaskets, but I still get 25 on the highway and 19-21 around town. Could be the new plugs I put in at the change. I was runnin Bosch +4's Now I'm runnin the Split Fires. From what i've been hearing though I think my next change will be to Motocraft. I would have last time but they were sold out and I was ina hurry. A good tune up can go aong way towards good gas milage though, along with fuel injection cleaner, new fuel filter, etc...
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