Gas Mileage (MPG)

Like evaluating the price of a used 2005 Jeep Wrangler, knowing the exact fuel economy is difficult due to the variety of customizations done to TJs and LJs – namely lift kits and oversized tires.  In addition the Unlimited models with a longer wheelbase and higher gearing change the MPG significantly.

Below are factory expected MPG for the 2005 Jeep Wrangler

  • SE w/ 4cyl 2.4L Manual Trans – 16 City / 19 Highway (17 Combined)
  • 2005 TJ 4.0L I6 Manual – 13 City / 17 Highway (15 Combined)
  • 2005 TJ & LJ 4.0L I6 Automatic – 13 City / 16 Highway (14 Combined)

2005 Jeep Wrangler MPG

Listed below are various technical, functional modifications / features that will affect a 2005 Jeep Wrangler’s gas mileage.  Some of these changes to the stock design can have drastic immediate effects (i.e. 4 – 5 miles per gallon) while others only create a slight change that could take hundreds of miles of driving to notice.

 

Mods or Features that will negatively affect MPG

  • Larger than Stock Tires (Particularly Knobby Mud Terrain Tires)
  • Lift Kit (Suspensions Changes)
  • Permanent added weight to Jeep including skid plates, custom bumpers, winch etc.
  • Gearing Ratio
  • Hardtop vs Softop vs No Top
  • TJ vs LJ

 

Ways to Improve 2005 Jeep Wrangler MPG

  • Cold Air Intake
  • Cat-Back Exhaust
  • Throttle Body Space / Injector
  • Programmer Kit
  • Tune Up / Oil Change
  • Proper Tire Inflation

 

What is the Real Impact?

While the list of ways to improve a Jeep Wrangler TJ MPG is similar in length as the ways fuel economy can be negatively impacted; they have far less impact.  Many of the items on the “improve” list are more designed to help with horsepower, maybe adding up to 50 max.  The reality is that if a 2005 Jeep Wrangler is lifted and oversize tires are put on it (33” – 35”) it is likely to get 10-12 miles per gallon.  This can be remedied via re-gearing and one or more of the items on the improve list, however this will be negated by any added weight.  Additionally a full soft top or (Safari, Trail Jammer, Tonneau Cover Combo) are ideal for the best gas mileage, as a hard top adds over 100 pounds and no top allows for more wind drag when driving.

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