IMO, these are a must if you're going to add a bunch more horsepower. With my mods. (see signature below) both 5.7's now put out about 420-440 hp and somewhat over 400 lb. ft. of torque from about 3000-5800 RPM. As far as the torque converter goes, about all you can do with it is change the engage/disengage RPM. frankly no need for 89. every 5.7 hemi says 89 is recommended for optimum fuel economy and power. owners manual clearly states 87 is fine to use. 1998 XJ 2DR 4.0L 5spd / 2017 GC SRT.sold / 2022 wrangler.sold / 2023 GCL SR Hemi. Especially when gas spikes up high, I just try to drive less, coast more and go easier on the gas pedal. At 13,000 miles I average about 14.2 mpg over the last 2,500 miles with combined city/highway driving. John. 2006 Jeep Grand Cherokee Limited with 5.7L Hemi in Bright Silver. Bloomington-Normal, IL. As long as it's top tier fuel, 87 is fine. IF you want the maximum HP the engine is capable of making, use 89. I haven't noticed a fuel economy increase with 89, my back-roads commute of 14 miles each way, in the winter/cold spring I'm getting around 15-16mpg. I usually use 89, usually Marathon brand. Fuel Consumption - Economy Combined: 17 MPG 14.1 L/100 km 20 MPG UK: Is 2014 Jeep Grand Cherokee (WK2) 5.7 V8 HEMI Overland All Wheel Drive (AWD)? Yes, the 2014 The entry point is a 3.6-liter V6 making 293 horsepower and the optional mill is a 5.7-liter Hemi V8 with 357 horsepower. The Jeep Grand Cherokee L’s fuel consumption numbers may come as a Gwx5A. Jeep Grand Cherokee Eco Mode. According to fueleconomy.gov, the more recent 2022 Jeep Grand Cherokee’s annual fuel cost is about $2500 on average. So it is big money to spend. Most manufacturers imbed Eco mode (“economical mode”) in their vehicles for Better fuel economy. Jeep Grand Cherokee Eco Mode underrates your fuel cost. For more information about the Grand Cherokee L's fuel economy, visit the EPA's website. 2021 Jeep Grand Cherokee L 4x4 V-6 Vehicle Type: front-engine, 4-wheel-drive, 6-passenger, 4-door wagon With over ten years and counting, the VCT 5.7L HEMI V8 engine has been used in Chrysler 300C, Jeep ® Grand Cherokee, Dodge Durango, Ram pickup trucks, and Dodge Challenger R/T and Charger R/T models. So, there’s plenty out there waiting for a new life between the fenders of a cool old Mopar car or truck.

jeep grand cherokee 5.7 hemi fuel consumption