Whereas SUVs get a bad rap within the press today about being not very gas efficient, the Jeep Cherokee XJ is able to getting quite good gasoline financial system. It may not match a Prius or a Civic however I wouldn't attempt to take certainly one of them off road either. The first step in bettering the fuel economy of the jeep is to ensure it is operating appropriately. Guarantee that all connections to the ECU are clear and properly linked. Also verify all the ground wires. There are at the least three different computers used in the XJ collection of Jeep Cherokees. The Jeeps made by AMC used the Renix laptop system. This system uses just a few extra inputs than the later Mopar system and in some methods is extra advanced. The Renix system uses a knock sensor and is due to this fact capable of tuning the spark advance curve to an optimum mix. Some Renix controlled engines like the one in my son's XJ Wagoneeer will really get higher fuel economy using greater octane fuel. The gas financial system increase is enough to greater than offset the extra value of the upper octane fuel. You will have to experiment with your individual engine to see if increased octane fuel will give better gas economic system and higher MPG. For most engines, the 87 octane fuel will give the very best gas economy. Also, note that there is a big distinction in fuel qualities from various distributors. Ethanol content material lowers MPG as well as many different additives. Once more you'll have to experiment with gas form numerous distributors in your area to see which one gives one of the best gasoline for the highest MPG. In my area it is the Shell station that provides the most effective fuel financial system when comparing gasoline cost to MPG. The ignition timing of the XJ Cherokee shouldn't be adjustable. The ECU controls these capabilities on a set table and suggestions from the knock sensor if geared up. However it is possible to trick the ECU into advancing the timing by adjusting the mounting points of the Crank Shaft Position sensor. By merely slotting the holes, the sensor may be repositioned to adjust the precise ignition timing. As cars of excessive problem of accessing he mounting bolts of the CPS and the minor enchancment in gasoline economy, this modification made not be value the hassle. Adjustable CPS sensors can be found from some Jeep accessory distributors. One among the most important components that results the MPG of a Jeep Cherokee is it transmission. While the Asin 4 speed automated could be very durable and options a lock up torque converter, it simply cannot match the gasoline financial system of the 5 velocity handbook transmission. In case you are selecting a Jeep for gasoline economy, select one with a five pace guide transmission. Additionally, be aware that if you have a 242 switch case also know as selec trac, you might have the option of full time 4 wheel drive. Do not use it until the highway is slippery. You'll get the very best MPG by using two wheel drive. Whereas a disconnect entrance axle was supplied on some Cherokees, on many XJs the entrance drive shaft is at all times coupled to the drive axle. On the non disconnect axle vehicles, you may improve the gas economic system by removing the entrance drive shaft. Simply remember that you should have to place it back before you need to use 4 wheel drive. Tires make a giant effect on MPG. While fitting a Jeep with larger tires is frequent, there can be a huge detrimental impact on gasoline economic system. Bigger tires are usually wider and have a more aggressive tread pattern than the smaller road tires that originally came on the XJ. Using a set of narrow, low rolling resistance tires will help MPG in street driving. On one Jeep Cherokee I own there was a noticeable increase in fuel financial system when i temporarily fitted a set of OEM sized tires. For greatest gasoline economic system, it's possible you'll wish to contemplate having a set of road tires and set of off highway tires. It doesn't matter what tires you run, you will need to pay shut attention the tire stress. Typically talking, the higher the tire stress, the higher the gas economy. You'll have to regulate the air pressure in your Jeep by balancing the elements of tire wear, experience comfort and traction. At all times keep your tires correctly inflated and air again up before driving on pavement after your off road adventures. One other huge issue for MPG is wind drag. Even the manufacturing facility roof rack makes a noticeable difference in gasoline economy. To maximize gasoline economy, remove and roof racks or different roof mounted equipment. When lifting a Cherokee, it is not uncommon to remove the factory air dam. Nonetheless, this little piece of rubber does enhance gasoline financial system. Keep it in place and straight for best MPG. Also the rubber mat below the engine helps to enhance air movement below the XJ for a slight improvement in gas economy. One other common modification that reduces fuel economic system is armor and safety accessories. Your bumper guards and skid plates and rock trails add weight and in some cases disturb the air flow. Consider the effects on fuel financial system when making these modifications. Correct wheel alignment will increase MPG as effectively. The entrance tires have to be pointed as near straight ahead as attainable. Set the toe in as close to zero as possible. The inverted Y steering association of the XJ causes the toe to change with journey top so to maximize the gas financial system, set the toe with the Jeep loaded as you usually drive it. Probably the largest single issue effecting gas economy is your driving fashion. To maximize MPG, begin off slowly and maintain a gradual speed. Avoid pointless stops. Keep moving as a lot as attainable even at a really gradual pace in stop and go site visitors. Try to anticipate hills and accelerate before gong up the hill. Let you pace drop naturally hill climbing the hill. Avoid long idle times especially with the AC on. One questionable space of increasing gas financial system that I've had combined outcomes with is fuel additives. Many individuals have reported that adding a small quantity of acetone to the fuel will enhance the MPG. I haven't observed any measurable increase from adding acetone. Nonetheless, occasional use seems to prevent stumble and misfires so it seems that it might improve MPG. Attempt it by including one ounce of pure acetone for each ten gallons of gas. Another additive that appears to assist cure gasoline provide problems is Seafoam. Seafoam smells like an alcohol blend and doubtless helps mostly to remove moisture from the fuel system. Nevertheless, I've discovered quite a lot of gasoline related points kind clogged or sticking injectors to carbon fouling of the combustion chambers seems to be helped by including a can of Seafoam to the gas tank. Oil choice and oil additives may also be used to increase MPG. However 2021 Ford Bronco Sport Badlands on the engine should be thought of when choosing oil. Utilizing lower viscosity oil can assist improve MPG. Nonetheless older engines could not lubricate properly on low viscosity oils. An additive like Friction Free 3000 has been proven to increase MPG by reducing internal friction in the engine. Give it a strive in you engine to see how it really works for you. At all times use top quality oil in your Jeep Engine. The design of the 4.0 block causes some parts of the block to be highly regarded and will trigger wax or paraffin primarily based oils to separate. Wax based oils will should be modified more incessantly on account of thermal breakdown. Preserving your Jeep properly lubricated in different areas will even help boost MPG. Examine differential fluids, switch case fluid and the transmission fluid on a regular basis to keep up proper lubrication and reduce drag. Locker and limited slip differentials could need to be examine more ceaselessly tan the manufacturing unit recommended intervals. Additionally, if there may be any likelihood that water has entered these components due to off highway adventures, change the fluid because the water and grease mixture has poor lubricating high quality. By proper maintenance and a being aware of the effects of widespread modifications, you'll be able to maintain reasonable fuel financial system in your Jeep SUV. Greater fuel costs don't must imply the end of your 4 wheel enjoyable. It could even make some modifications like a second set of tires more economically viable. So listen to details and enjoy driving your Jeep Cherokee.