Hemi mpg - JeepForum.com

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post #1 of 17 Old 12-28-2005, 07:30 AM Thread Starter
cacmndr
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Hemi mpg

Hey guys, just wondering what kind of milage you are seeing out of the Hemi. I just hit a 1000 miles. The computer is avg 12.9 mpg. I hand calculated it over 3 tank fulls and its avg out to 15.1 mpg, not to bad I guess.

It sure is hard to keep your foot out of it though


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Last edited by cacmndr; 12-28-2005 at 10:04 AM.
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post #2 of 17 Old 12-28-2005, 09:13 AM
SGilbert
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I averaged 15.9 on a 1600 mile trip, but that was with a brand new engine----1 day after I took delivery! Hope to get that well up into the 16's or beyond.

'14 Cherokee Ltd V6 AWD; '11 Lincoln MKT AWD EcoBoost; '00 Regal 29' Commodore
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post #3 of 17 Old 12-28-2005, 10:21 AM
Woody
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Consider yoursleves lucky. The Hemi trucks get about 12 on average. There's a guy with a Hemi Durango in the shop and he's had it almost one full year. He still says his best highway mileage is 14. The Hemi is powerful, but you've got to pay for that power somehow.

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post #4 of 17 Old 12-28-2005, 04:21 PM
INTREPER
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I thought the Commander had that system that shuts down some of the cylinders down to save gas?
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post #5 of 17 Old 12-28-2005, 04:25 PM
Woody
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Only when you are cruising on the highway. Still 16 is about the best you'll ever see. Same problem with the Hemi Grands. Turn the system off and you see around 12.

Woody
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.
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post #6 of 17 Old 12-28-2005, 05:48 PM
SGilbert
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And HOW would you turn the "system" off? I can't even tell when it acticates!

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post #7 of 17 Old 12-28-2005, 06:24 PM
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Quote:
Originally Posted by SGilbert
And HOW would you turn the "system" off? I can't even tell when it acticates!
Are some website out on google that tell you how to deactivate it...best way to do it is to keep your gas floored Drive next to a barrier with your window down. The sound of the MDS system using a different exhaust system will echo back off of the barrier and you should be able to hear it.

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post #8 of 17 Old 12-28-2005, 07:16 PM Thread Starter
cacmndr
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my only complaint thus far in regards to fuel is the size of the tank. I feel like Im constantly at the fillin station

But then agian my daily driver is my cummins which gets 22mpg out of a 30+ gallon tank.

It'll take some getting used to

06' Commander Limited, 5.7 Hemi, Loaded, stock for now....... :)

My other toy, "COAL DUMPER"
01 Dodge CTD HO 2500 4x4 Quad Cab Sport LB, Edge Comp,175 hp Injectors, Haisley Street Drag, Silencer Ring MIA, BD Short Shift, FASS, AFE Mega Cannon, A- Pillar, Stewart Warner Boost, Exhaust & Fuel Pressure Gauges, Straight Pipe, Billet Locking Fuel Door, Grill, Silverstars, 2" Day Star Spacers, Bilstein shocks, BFG 35/12.50/18, Pioneer in dash DVD w/ Rockford Fosgate Subs & Amps
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post #9 of 17 Old 12-28-2005, 10:02 PM
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I'm starting to see 14-15's now, after 4400 miles, and the Gibson Exhaust, if a good amount of freeway is involved.

Before I would see 12-14 mpg.

Not scientific research, just what I am seeing on the display, with occasional resets.

'06 Commander Ltd, 5.7L Hemi, QDII, Midnight Blue, Gibson Exhaust, Raingler Net, K&N FIPK, Remote Start, Optima Yellow, Skid plates & Tow Hooks, Rocky Road 2.25 Lift, New Rear DT Shocks, 265/70R17 REVO's, 6061-T6 Custom Wheel Adapters, 4xGuard Rock Rails/Steps
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post #10 of 17 Old 12-29-2005, 10:44 AM
NJNorm
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I'm closing in on 3,000 miles now, since buying the Commander about 2 months ago.

According to the trip computer, I am consistently getting 16mpg on the highway (based on the 200mi round trip to Philly that I make about twice a month.) I average about 10-12mpg on the local roads.

I fill it with Exxon Plus (87 Octane). Has anyone tried Regular in the Hemi?

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post #11 of 17 Old 12-29-2005, 11:20 AM
SGilbert
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Don't you mean 89 octane? That's what the PLUS means.

I want to put 87, but the wifie won't let me...it's her Jeep!

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post #12 of 17 Old 12-29-2005, 03:35 PM
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Er, right. Plus is 89, Regular is 87. I've been using 89 (the "recommended" choice per the owner's guide.)

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post #13 of 17 Old 12-30-2005, 05:46 PM
nylyon
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In a Hemi Durango, I am seeing 19 highway, the 05's don't have MDS either.

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post #14 of 17 Old 12-30-2005, 07:51 PM
Woody
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Quote:
Originally Posted by nylyon
In a Hemi Durango, I am seeing 19 highway, the 05's don't have MDS either.
Hmmm... Must've got a good one. Yours a 4x4?

The neighbor has a SRT-8 6.1L in a 4 door car. It sounds mean but uses more gas than his Expedition. He gets 9 in town and fourteen on the highway. It sits in his driveway a lot. He owns a Grand Prix as well and drives it most of the time for mpg.

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post #15 of 17 Old 12-30-2005, 10:21 PM
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Maybe he is running 40+ PSI

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