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  #11  
Old 01-03-2013, 05:00 AM
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Matt_ Matt_ is offline
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To translate "the use of 89 octane is recommended for optimum performance" means 87 can be used but expect timing to be pulled to prevent spark knock. Pulling timing equates to reduced performance and efficiency.

Dont know how to spell it out any clearer than that. If you could have the same power and efficiency with 87, 89 wouldn't be recommended.
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Last edited by Matt_; 01-13-2013 at 07:12 AM.
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  #12  
Old 01-12-2013, 10:35 PM
Venomized Venomized is offline
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Quote:
Originally Posted by DRamrod View Post
I know the plugs were changed at 40k miles. It doesn't hurt to do them again. I use 87 Octane on the 5.7l because 89 in Nebraska has 10% ethanol and I don't trust it. Not too certain about the PCV. The Air Filter is a new drop in K&N installed 2k ago. The dealership changes the oil. I got them to change the oil for me for the next 6 years (part of the deal) for free.
Does cleaning the Throttle Body really help? Or do you guys spray cleaner on it and call it good?
I have used the 10% ethanol fuel for many thousands of miles in all of my vehicles since that is pretty much all I can get here in Indiana. No problems at all with it
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  #13  
Old 01-13-2013, 12:10 AM
Teddyyo Teddyyo is offline
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Low levels of ethanol will not harm your engine...we are driving extremely modern cars, not 60s hot rods - those are just about the only things I've heard get damaged by ethanol.
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  #14  
Old 01-19-2013, 03:57 PM
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redrockv8 redrockv8 is offline
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I Love my Commander. Absolutely the finest vehicle I've ever owned. No one ever bought a Jeep for it's fuel economy. I have 69,500 miles on my Commander with zero problems. (well the sunroff drains did clog up but I easily fixed that) I've been to the mountains of Colorado, Arizona, Wyoming, New Mexico, Utah, a zillion places inbetween and all along the Redneck Riviera and this baby never missed a beat. If she needs gas I put it in and never worry about MPG's. I keep it well maintained with the finest oil, sparkplugs, filters, differential, transfer case. Mine rides like a dream while cruising down the road listening to BB King's bluesville on channel 70 sirius radio. Damn, I think I'll remotely fire her up and head out for a drive. It's a beautiful day here in Missouri. We don't have mountains here but sure have some beautiful hills to glide up and down.
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  #15  
Old 01-19-2013, 04:41 PM
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Atsah Atsah is offline
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OP, at no time in the purchasing of a box with a Hemi in it did you not figure out that your MPG was going to suck? Why would you buy something you don't like, it sounds to me like it's not only the mpg that you don't like about the Commander since in your opening post you say your considering a lift so that you will like the Jeep.. I don't get it..
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  #16  
Old 01-20-2013, 09:52 AM
Grenadiers Grenadiers is offline
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Before buying our '10, we looked at Grand Wagoneers. I've had 5 of these over the years, and being a mechanic, was able to keep them on the road. Our two dogs loved our last one, an '85 we bought out of New Mexico. Rust free, excellent interior, and after I converted it to EFI, using GM TBI parts, and an aftermarket wiring harness, it was totally reliable. However, even after the EFI conversion, 11mpg was all one could expect on the highway.

Wifey was not too happy to have to constantly stop and fill the 20 gallon tank. So, with much regret, we sold it. Made some good coin on it though!
After looking at a couple more GW's, in not so good condition, gave up on buying any more of those.

Our '10 Limited is great, wife can drive it, and I like it too! It's a dual purpose vehicle for us. One, it can maneuver up and down the dirt switchbacks at our place in northern Arizona. And two, we have a seasonal restaurant back in Wisconsin where we'll use it to haul in supplies.

Yesterday, took the dogs for a ride in the warm sun. Stopped off at a restaurant, and sat outside. Using the remote to pop up the rear window, the dogs couldn't have been any happier. Us too!
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  #17  
Old 01-23-2013, 06:59 PM
chrali chrali is offline
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Quote:
Originally Posted by a49erFan View Post
When you drive a brick you can't expect to get 25 mpg.
You can if its a CRD like mine

Seriously though, there are days I love it and days I think its just okay, but on those days I remember that's its better than the alternatives at that age and mileage.

Yeah perhaps you did buy wrong, you won't be the last case of buyers remorse
in the world, but how come you didn't check the mpg BEFORE you purchased it?

What did you like enough to buy it?
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  #18  
Old 01-24-2013, 10:36 AM
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Atsah Atsah is offline
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I get between 18-20mpg with my 3.7.. It's a little weak but I have gotten use to it.. The motor runs great, it has a great ride, the 4x4 works great in deep snow and it's just different from any other SUV out there and those are the things I like about it.. I really haven't found much I don't like about it.. The interior is comfy and everything works well.. I have taken some long trips with it and I drive it for a long time without wanting to get out and stretch.. I also like that for what it is, it's heavy and you can feel it.. It's also the best vehicle for headroom I have ever owned, my 110lb German Shepherd loves all the room, I took the second row seat out and made the back seat area flat with a plywood floor covered with carpeting..
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  #19  
Old 01-24-2013, 10:55 AM
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I had a similar problem when I bought my XK, switched to Sunoco 89 and went from 9.8 to 12.3.. Then made some minor mods like CAI which I know everyone says doesnt help, but it did. Also after a DiabloInTune my mpgs were consistently at 13.3 with the 91 tune. Also keep in mind winter fuels have additives that make it easier to burn in cold weather which has my current mpgs to 12.5. Id do proper maintenance plugs, pcv, and DEFINITELY throttle body cleaning. the TB is easy to clean, unplug it, 4 bolts and it comes right off. Unfortunately the emission systems on the HEMIs suck, IMO, so the oil vapos pass the pcv easily going into intake and back of TB. A cheap mod to consider would by an oil catch can as well, this prevents this build up. Again start with maintenance and change fuel, go from there...
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  #20  
Old 01-24-2013, 11:07 AM
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Quote:
Originally Posted by Atsah View Post
I get between 18-20mpg with my 3.7.. It's a little weak but I have gotten use to it.. The motor runs great, it has a great ride, the 4x4 works great in deep snow and it's just different from any other SUV out there and those are the things I like about it.. I really haven't found much I don't like about it.. The interior is comfy and everything works well.. I have taken some long trips with it and I drive it for a long time without wanting to get out and stretch.. I also like that for what it is, it's heavy and you can feel it.. It's also the best vehicle for headroom I have ever owned, my 110lb German Shepherd loves all the room, I took the second row seat out and made the back seat area flat with a plywood floor covered with carpeting..
You're all highway driving. I get 11.8 city driving, and i've installed the k&n cai, clean the TB and replaced the sensors attached, new plugs and run high grade synthetic. I'm gonna order a pcv valve, see what that does. My my road trips are around 18+ mpg though
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