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You are watching: 2005 jeep grand cherokee 5.7 hemi mpg


I am getting about 12 - 13 MPG on my 2005 Grand Cherokee HEMI. Maybe around 240 or so per fill. Any ideas on how to get better MPG? The Jeep seems to be drinking more gas every day.
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Sounds about right relative to our XK. They should have really installed a larger tank. A tank that would allow a 25 gallon consumption before the light comes on would have been better.
That sounds about right, I get 13-14 city with magnaflow cat-back, Air-raid Jr. Intake tube, and superchips 91 tune, with larger tires 255-70 R17. MPG is sacrificed for raw power, and fun factor :cheers2:
yep... city is about 11-13 for me as well with 5.7 hemi stock. I try to use my other car for city driving, and Jeep for vacations, longer trips.
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I am getting about 12 - 13 MPG on my 2005 Grand Cherokee HEMI. Any ideas on how to get better MPG? The Jeep seems to be drinking more gas every day.
Buy a Diesel!The Hemi is an absolutely lovely engine but for EVERYDAY use it offers nothing over the Diesel and as you are now finding out is THIRSTYI live in the UK. Our Gallons are slightly larger than yours therefore seeing as i get 25mpg in the UK. that equates to 21mpg using US Gallons.Just lucky that you are not paying £5 a gallon or $8.15 as we are over here.Darryl:thumbsup:
Buy a Diesel!The Hemi is an absolutely lovely engine but for EVERYDAY use it offers nothing over the Diesel and as you are now finding out is THIRSTYI live in the UK. Our Gallons are slightly larger than yours therefore seeing as i get 25mpg in the UK. that equates to 30mpg using US Gallons.Just lucky that you are not paying £5 a gallon or $8.15 as we are over here.Darryl:thumbsup:
Actually since a UK (imperial) gallon is larger your mpg number would be higher than a US mpg so it would work out to a little under 21 US MPG.
2008 GC CRD, OME 2" lift kit, 265/70/R17 Cooper Discoverer S/T"s, 1.5" Spidertrax spacers, gutted turbo resonator
Actually since a UK (imperial) gallon is larger your mpg number would be higher than a US mpg so it would work out to a little under 21 US MPG.
Correct, Had my brain in neutral.Still, i can never understand anyone buying a Large 4x4 with a 5.7 litre petrol engine and then worrying about fuel consumption AFTER the purchase.Even my Diesel can never be classed as economical but i knew what i was getting into even at our fuel prices.Typically, how much is a gallon of Petrol in your country now?
I have an 05 wk limited 5.7 and I get about 10 in the city, but i drive it like I stole it
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I have k&n intake and flowmaster exhaust. So all the above sounds about right for city driving. The only problem I see is your Hwy mpg. I get 19 mpg on the hwy! (I live in Texas, its really flat) Your getting 14.5 on the hwy. thats crazy.
I was just thinking, maybe your mds isnt working properly! What wieght oil are you running? If you run anything other than 5w 20 your mds isnt going to work properly! Just a thought!
I get ~16mpg town/rural and 19.3mpg highway. Several other threads within the last month on this.Your miles are unknown, but I found that the backside of the intake throttle body was caked with sludge at 36K miles. 90grandoneer was a big help to me and recommends an oil can to catch the crankcase oil that chokes it. Remember, you are mostly running part throttle, so it accumulates right where the butterfly closes.Can"t describe how amazed I was at the amount of crud buildup there. From the front side, the throttle body was clean. Several before / after pictures are posted by others in some other threads.My best recommendations that you can do cheaply and quickly:1. New air cleaner element. There are some brand comparisons in this forum to read before you buy.2. Spark plugs (Champion #570 copper core) every 30K miles. No platinum; no upgrades, no other brands. These engines seem to be very sensitive to spark plug selection. Lots of horror stories in this forum from those who did not replace the spark plugs with Champion copper core plugs (or MOPAR OEM plugs) for the 5.7L HEMI engines.3. Verify that the engine lubricating oil is 5W-20. Several others have had 10W-30 oil installed by their Jeep dealer. This alone will cause your MDS sytem to malfunction. I used Castrol Syntec 5W-20 oil & a K&N oil filter this time and changed it myself. AutoZone had a special of 5 qts & a filter for $29.95. Car performs somewhat better and definitely uses less oil. Read this link: Jeep Grand Cherokee WK - Engines .4. Clean the back side of the intake throttle body. Use a gentle solvent like rubbing alcohol on the machined surfaces; nothing harsh. I"ve never used Seafoam so I have no comparitive basis, but Jeep does not recommend cleaning the intake manifold with solvents. I did gently clean the throttle body back side with alcohol. No codes or adverse effects.Be interested how you make out. I would think that 13mpg city & 18-19mpg highway are reasonable results for a happy 5.7L HEMI engine. I periodically check the electronic mpg indicator the old-fashined way. It runs about 95% accurate. Recommend you do the same (if you haven"t already).

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HEMI CLUB MEMBER #45; SILVER WK CLUB MEMBER #13"08 WK GC Limited. 5.7L HEMI. Quadra-Trac II. Bright Silver Metallic. Class IV hitch. Michelin LTX M/S tires. Fumoto oil drain valve. Billet Technology oil catch can.