Here's what I do:
I have Firestone Destination LE's and I keep them at 45 PSI.
On the highway I fold in my mirrors.
I take a long time to get to highway speed.
I never drive faster than 60 MPH.
I take my antenna off on long drives and use XM.
I ALWAYS use cruise control.
Doing these things recently got me MPG numbers of 34, 34.7 and 35 MPG on a road trip to Arizona.
I also ALWAYS use a fuel additive in every tank. Lubromoly, Stanadyne or Amsoil.
My best number has been 38 MPG. That was with the stock tires and they were very low on traction. Fuel numbers arent new with me. I have a 2001 TDI Jetta that gets 62-65 MPG on the highway.
Is 45 PSI even in the recommended range of running those tires? That isn't safe to me anway. Once you get that high, you are just cuping the tires, wearing them out sooner. Buying tires before their typical life service is up does nothing but offset the gas $$ you are saving.
I don't think the offset of folding in your mirrors and the decline in safety is worth the .02 MPG you are getting from doing it. You're driving a freakin' brick to start with. It is probably illegal in most states anyway. Folding the mirros in while driving is that same as removing them and you are required to have at least one on the driver's side. You get a ticket for that, you will erase any savings you might have gotten by folding them in over the whole period of time you have been doing that x 10.
People that take a long time to get to highway speed are a hazard and quite annoying.
People who don't drive at least 5 mph under the speed limit are a hazard and quite annoying. It is very frustrating to come up on someone like you and having to slow way down and then have to get up the speed/nail the gas to get in the fast lane to get around you. While you are saving a gallon for yourself, you are making a lot more people waste even more gas around you. You are basically becoming an uneccessary obstacle in the road.
Seriously, you remove your antenna? Why remove the niceties of driving to save hardly anything.
The only thing I understand is the cruise control idea.
Fuild additives in every tank decreases mileage. While I agree that fuel system cleaners work well when used at oil change intervals to help keep the system clean, it doesn't make sense for every tank. Even if it saves mileage, you aren't going to save enough in mileage to offset the cost of the additive.
If you are simply seeing what you can get squeeze out of your Jeep for a few tanks, fine. Have at it. You ought to remove everything in the interior except for the driver's seat, steering wheel and pedals. But your tacktics aren't saving you any money if that is what you are shooting for.
It seems to me like you are a little obsessed with this mileage thing. I can understand people who try to drive normal, don't race around and try to keep their vehicle in top condition to get as good a mileage as possible for normal driving, but trying to squeeze out every 1/10 of a MPG constantly only removes the driver from the experience of driving, is unsafe when taken to far, has you worrying more than you need to be and is generally pointless in full reality. What do you ultimately gain from getting 38.1 as opposed to 37.8?
