well, I did drive across alberta and was averaging 900-1000 km on a full tank , a little tired right now so didn't convert to us lol. The highways there the average speed is what I was doing yesterday at 75-80 MPH , so around 120-130 KPH.With city driving I usually get around 600-650 to a tank , but that's a lot of short stop and go driving and of course the idling at stop lights.This trip I was curious to see what the computer was saying , and for the whole trip , other than the 2 stoplights on the freeway , was saying 20-21 MPG.For the whole trip I used 1/4 of a tank of gas , for almost 4 solid hours of driving.

I know with my work truck , I average around 16 MPG with a 6.4 twin turbo diesel in a F350.The tank on it is also a little smaller than my jeep.My trooper has a smaller tank , and because of the gearing and tires , I was getting around 14 MPG in there on highway , and if lucky maybe 10 in city.

As for gas I was using , it was from Husky(Mohawk) and their regular gas is same as premium at other stations being 91 octane.Hope that helps explain more , don't know what they use for additives other than 10% ethanol , but most people don't realize that there are only 3 refineries in western canada , so the gas is the same , just everyone has a little bit different additive to put in it.

And if your wondering what all I have done to the jeep so far , its minor stuff.I put in a cold air intake with a heat shield to keep the engine heat from affecting it too much , a 3/4" ring on top of the TB for a little more air , new plugs , cap , rotor , 80 thermostat , a different coil(hotter spark) and a larger exhaust.I think that's all I have done other than the LED tail lights and brighter headlights and new stereo , although the old memory isn't as sharp as you get older <img src="/forums/images/graemlins/scared.gif" alt="" />

Could tell you more about the trooper as it was a frame up build and most was total custom stuff on it.The jeep won't be altered too much from stock , too little time and space <img src="/forums/images/graemlins/smile.gif" alt="" />