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I have a 2012 2 Door Wrangler and previously had a 97 TJ 4cyl with 5speed and 33in swampers.
I lost 3~4mpg when I switched my stock 32in tires for 35in tires. So, keep the tires thin and stock or smaller.
There are aluminum skid plates that cover the entire undercarriage. Folks in the JKforum have posted increase of 3~4mpg with that alone in highway driving. Those skids are good for off road and lightweight only downside is they are $2,000 or so.
Then you can make it lighter weight. Take out the back seats, put in aluminum tailgate, aluminum bumper, ect...
Unfortunately; almost all mods to improve MPG or reduce weight will cost a huge amount of money with TJ or JK Jeeps.
bigC
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