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  • #16
    I can't say about for sure about the tranny, but I did some reading online, that suggested it's a 3 speed. Since my posting I bought a bottle of STP fuel injector cleaner additive. That alone has done wonders. I had to get two rolls of field fence, hooked up a 5'x8' trailer, and headed off. It was about 26 mile round trip, I had a half tank when I started out, when I got back, the needle had just come off the 1/2 mark. Before, with-out pulling a trailer on a 25 mile trip I would have burned 1/4 tank of fuel.
    Last edited by TJNewbie; 01-09-2010, 02:02 PM.

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    • #17
      How cost effective would it be to put in a 4 speed tranny? ie cost of a tranny, labor, expected MPG? Thanks

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      • #18
        Dude you drive a jeep, your gas mileage is not gonna do good no matter what...

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        • #19
          Jeeps have the arodynamics of a brick. Gas milage nice to have but to have a functional jeep that looks good you have to make sacrifices if you want to drive it on the road.

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          • #20
            as someone mentioned earlier, make sure you corrected for the tire size, or else your odometer will be off, and then of course your mileage estimate will be in error.

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            • #21
              The fitch results were A) not repeatable B) Fitch is paying an advertising contract to JP. The bottom line of all the stuff about fuel catalysts and hrydrogen injection are BS and have no real scientific basis. In fact they are counting on your ignorance to get you to buy. It sounds kinda feasible and it really doesnt cost that much so what the heck, why not? Well cause its bunk and cant be proven. Even if you just do some basic math these systems dont add up, and the "test" results dont even come close to their claims.

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              • #22
                I feel the Fitch Fuel catalyst is what it claims. I've been using it for 5 years with a reprogrammed computer that wants 95 octane gas and I run 87 or 89 without problems.

                Also, the Trucks program (TV variety) ran it through dyno tests last year and it proved itself.

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                • #23
                  Does octane do anything for mileage....Iv been told that it does what do you guys think??

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                  • #24
                    Originally posted by GOT MUD View Post
                    Does octane do anything for mileage....Iv been told that it does what do you guys think??
                    At least for a TJ, no. Several times I have accidently filled up with the super stuff (doh), and gotten worse gas mileage. Same holds true for the 3.7L Liberty.
                    It has become a particular pet peeve of mine that some service stations reverse the gasoline grade order on the pumps - I believe in an attempt to screw the unwary. And when distracted, I am clearly among the unwary.

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                    • #25
                      I only drive with a tail wind. It increased my mileage by 3MPG.

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                      • #26
                        Run the tires up to a comfortably high pressure (~40 PSI). Watch out for wobble. Added pressure is good for a couple of MPG. Other things that may help: High flow intake. High flow exhaust (check to see if your cat is glowing after driving. Blocked cats are reduced power/degraded FE.) Sounds like a bunch of marbles when you start up: Possible cat brick degradation. DO NOT expect better FE out of premium fuel. The PCM doesn't care. Granny driving is good: keep it below 60. Electric load: Turn off the radio and any extra driving lights. Check for free wheel friction: Does it roll easy? Brakes binding? Driveline not moving clean? Any added driving lights? Aero drag at speed. Before you invest in a new transmission, switch to some road tires and put the bumpy shoes on when you are going out to play. Run them high too. Any spare stuff on your rig? (Jacks, extra battery, extra spare, junk in the back): Get rid of it all. Run as light as possible. If it is just you, remove other seats and make your friends drive to lunch.

                        OEM's pay dearly for small increments in FE. They have looked at all of these.

                        Critical few: Lose weight, slow down and wear comfortable shoes. Same applies to the jeep.

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                        • #27
                          Octane has nothing to do with mileage. Octane is merely the a rating that tells you how resistant to self ignition the fuel is. Higher compression engines need higher octane to keep form pinging.

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