Everything you need to know about each trim in the 2006 Jeep Grand Cherokee lineup, all in one place. Fuel Economy: City 15/Hwy 19/Comb 17 MPG HEMI, 5.7 Liter. V8, HEMI, 6.1 Liter I've seen 22 mpg but it seems a little low. 22 might be possible if mostly highway. We get about 16-18 overall with mostly stop and go local driving and some highway blended in. MPG ramps up pretty quickly once on the highway. We can briefly get to 21 for average or so after a few hundred miles of highway. Gas Octane for the HEMI. In reading the owner's manual on our 2007 Hemi Grand Cherokee, 89 octane is the recommeded fuel over regular and premium. With only 300 miles on our GC, I filled up with 93 octane Sunoco gas and I think I noticed a decrease in power. The next day, I added about 5 gallons of regular (after 60 miles) and the snap came back. We can help you calculate and track your fuel economy. MPG Estimates from Others; 2011 Jeep Grand Cherokee 2WD 8 cyl, 5.7 L, Automatic 5-spd I called up a service writer at a Chrysler, Dodge, Jeep, Ram dealer today to ask him for his thoughts. He said that he has a letter, from Chrysler Group L.L.C., stating that a little oil consumption is considered normal for the HEMI 5.7L in all of the cars and trucks. Chrysler rigorously tested the 5.7L HEMI, during development, to show that it One way to improve the gas mileage of a Jeep WJ is to ensure that the tires are properly inflated. Another way to improve gas mileage is to avoid excessive idling. The 2002 Grand Cherokee, 4.0, Laredo tow pack (basically 3.73s and a Mech fan) has a total weight of about 150K pounds. We can help you calculate and track your fuel economy. MPG Estimates from Others; 2021 Jeep Grand Cherokee 2WD 6 cyl, 3.6 L, Automatic 8-spd We can help you calculate and track your fuel economy. MPG Estimates from Others; 2020 Jeep Grand Cherokee 2WD 6 cyl, 3.6 L, Automatic 8-spd Here is the fuel economy info off the window sticker of each version. The salesman told me that the Hemi kicks down to 4 cyl when cruising on the highway and get better fuel economy at that stage. I noticed that disagrees with what the info on the sticker says. 22 mpg highway for the Hemi and 25 mpg highway for the V6. Yes, I know. Choose a Jeep Grand Cherokee 2017 version from the list below to get information about engine specs, horsepower, CO2 emissions, fuel consumption, dimensions, tires size, weight and many other facts. Notice also the plus sign to access the comparator tool where you can compare up to 3 cars at once side by side. b4r5z.