I have a 4 door rubicon (no mods) and im getting 17-18 mpg around town and 19-21 on the hwy. I just keep it below 60mph and change gears around 2500rpm's in tight traffic city driving i tend to drop down to about 15mpg but thats philadelhpia traffic which sucks.

 

I added a throttle body spacer and a KN drop in filter and improved mine by 1.5 mpg.
I also set my cruise all the time! If i'm in a 65 zone, I do 65! I use to drive 75 mph and only got 16 mpg. I average about 17.8 - 18 and if I'm all highway, I get 22 mpg!

 

I read an artical in Readers Digest about the hypermilers. Some of their trick might be worth picking up to same some money, but those guys are freakin crazy. The one guy said he was going down the street at 35 mph and shuts the car off and just coasts, and he was talking about doing it around a corner that had a recommended speed of less than what he was going. Said his wife hangs on for dear life. Thats a little out there!!! Woo Hoo NUT JOB

 

Not to mention strapping their car to the rear bumper of big rigs... Hyper milers tailgate like hell and consistently run stop signs. I could set Cruise Control to 62 MPH and blow through every red light and stop sign, but that would probably not be safe.

 

The best argument against hypermiling to me is the safety issue. With the engine off and coasting the steering and braking is impaired.

 

You should do the hybrid upgrade I hear it really helps

 

add a supercharger and regear, then drive very very slowly, i dont think it will make much difference but its worth a try

 

I've started driving my beater again, a 1987 Subaru Justy that gets 30 MPG CITY! Now that soccer season is over for two of my monsters, I'm not playing taxi every day after work.
It sat for months while I tried to locate a used front hub, but I finally found one (plus a spare) from a Colorado junkyard.
During that time, both rear brake lines rusted out.
The first test trip with the new hub was interesting, to say the least.
244,7XX miles and still purring along.
The body is falling apart around the engine, but I'm not driving it for looks!
It's always entertaining to park or pull up next to a compact car, since the Justy ends at about the rear wheel on most.
My co-workers say the most entertainment is to watch my 6'4", 250 pound frame climb out of it. They say they keep expecting to see a group of clowns come out after me. (har, har)

 

Not to mention how hard the alternator has to work to recoup the battery each time. So, to gain a little mileage, you're sacrificing battery, alternator and starter life. Not a good trade off.

 

one of the reasons i got my jk was for mpg, but then my 01 3/4 ton ram only got 9mpg, have thought about pulling the 360 and dropping it the wifes zj tho