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  #25  
Old 06-08-2010, 03:08 AM
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Re: My MPG is embarrassing to mention.

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Originally Posted by venusfan View Post
Wow, CG4x4.. I did a pricing on what u mention and just the muffler and CAI came to over $1K. For that I can take it to the dealer to probably get a complete tuneup for cheaper.
Buying a CAI for the sole purpose of trying to increase mileage would be a waste of money. If not properly designed, an aftermarket exhaust system can actually reduce mileage. Even if mileage gains existed with these products, you'd never come close to recouping the $1000+ investment.


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I think I'll try with the plugs,air filer and PCV valve first to see if it makes a difference.
Good place to start. Also have the dealer check the oxygen sensors.
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  #26  
Old 06-08-2010, 05:39 AM
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Re: My MPG is embarrassing to mention.

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Originally Posted by hobbes630 View Post
You can try starting you car 5-10 min before you leave for work so it gets a little extra time to warm up. See if that helps out at all.....if not try replacing the spark plugs and air filter
Idling for 10 minutes is probably worse for mileage than making short trips.
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  #27  
Old 06-08-2010, 11:47 AM
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Re: My MPG is embarrassing to mention.

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Originally Posted by UTJeffC View Post
Idling for 10 minutes is probably worse for mileage than making short trips.
^x2 that would be a horrible idea and only lower the mpgs even more. your vehicle is fine, you just dont drive it enough so the mpgs are going to stay low. there is nothing wrong with it.
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  #28  
Old 06-08-2010, 01:51 PM
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Re: My MPG is embarrassing to mention.

Damn guys! And here I used to complain about my 25 mpg @ 80 mph in my 400 hp (stock) GTO and yeah ,that thing had power!

Seriously though, I don't feel bad now getting ~15 city/19 hwy in the WK...chrysler vehicles never get good mileage for some reason and single digit is pathetic if you think about it - especially with only 400-hundred something HP and a relatively small efficient engine and overdrive...I understand weight, but that is disgusting mileage and glad I didn't opt for the SRT, ouch(even my chevelle with its thirsty 383-450+ hp carb'd engine with no overdrive that wasn't tuned (running badly) got low double digits)
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  #29  
Old 06-08-2010, 05:23 PM
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Re: My MPG is embarrassing to mention.

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Originally Posted by John_R View Post
Damn guys! And here I used to complain about my 25 mpg @ 80 mph in my 400 hp (stock) GTO and yeah ,that thing had power!

Seriously though, I don't feel bad now getting ~15 city/19 hwy in the WK...chrysler vehicles never get good mileage for some reason and single digit is pathetic if you think about it - especially with only 400-hundred something HP and a relatively small efficient engine and overdrive...I understand weight, but that is disgusting mileage and glad I didn't opt for the SRT, ouch(even my chevelle with its thirsty 383-450+ hp carb'd engine with no overdrive that wasn't tuned (running badly) got low double digits)
Funny that you mentioned... I was gonna bring up the same point. My 04 GTO is getting around 16/22 on 93. Its a 5.7 with some bolt ons and a mild tune.

Kind of bummed to read this as Im currently looking at getting a jeep with a hemi and was hoping to use it as a daily... Was hoping it would at least be in 20s hwy.
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  #30  
Old 06-08-2010, 05:42 PM
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Re: My MPG is embarrassing to mention.

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Originally Posted by LS1GTO View Post
Was hoping it would at least be in 20s hwy.
they are under highway driving conditions
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  #31  
Old 06-08-2010, 06:23 PM
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Re: My MPG is embarrassing to mention.

Important point is idling. Idling will affect your overall average because when you are sitting idle you are getting 0 mpg.
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  #32  
Old 06-08-2010, 06:36 PM
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Re: My MPG is embarrassing to mention.

mine is almost all around town and I have a highly modified drivetrain
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  #33  
Old 06-08-2010, 06:57 PM
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Re: My MPG is embarrassing to mention.

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Originally Posted by no-blue-screen View Post
Important point is idling. Idling will affect your overall average because when you are sitting idle you are getting 0 mpg.
Idling doesnt really affect your mpg as much as you would think. For example, according to my mpg reader on my gto, it only consumes about .5 of a gallon per hour at idle. Maybe about .8 with ac on.

But I think coasting does. On hwy if you speed up to say 75 and then let off gas and coast until you slow down to 70 and repeat the process. I've noticed a slight increase (about 2mpg) in doing this vs keeping speed constant. Dont have a jeep yet so cannot comment on it but I would assume it would work the same way.
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Old 06-08-2010, 07:24 PM
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Re: My MPG is embarrassing to mention.

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Originally Posted by LS1GTO View Post
Idling doesnt really affect your mpg as much as you would think. For example, according to my mpg reader on my gto, it only consumes about .5 of a gallon per hour at idle. Maybe about .8 with ac on.

But I think coasting does. On hwy if you speed up to say 75 and then let off gas and coast until you slow down to 70 and repeat the process. I've noticed a slight increase (about 2mpg) in doing this vs keeping speed constant. Dont have a jeep yet so cannot comment on it but I would assume it would work the same way.
True it isn't a huge amount, but it will reduce your overall average per tank. Using the .5 a gallon per hour figure....lets say you idle it for 15 minutes 5 days per week both in the morning when you leave for work and then when you leave work to come home. After one week you will have consumed 1.25 gallons of fuel. Let's say you fill up weekly and have a 20 gallon tank.... That equates to a 6.25% reduction in your average fuel economy. If you normally average 15mpg that would be about a 1mpg loss off your overall average for that tank. This scenario also results in the waste of 65 gallons of fuel per year. With a price of $2.50 per gallon that is $162.50 you could have saved over the course of one year. It all adds up.

With MPG that low in a 4.7 though, something serious has to be going on. The computer/EVIC is not 100% accurate. The only way to be completely accurate is to fill all the way into the neck each time and then track how many miles you went on what amount of fuel. You shouldn't top off a gasoline engine though because it can cause problems with the evaporative emissions system.

Newer vehicles will cut fuel when the vehicle is in gear and coasting. I know the mercedes diesel does this. One thing I always remember is that if you avoid using the brakes your fuel economy will be higher. When you are on the brakes you are converting more of your fuel into heat or wasting energy used to get up to speed. Frequent and rapid braking/acceleration will have serious effects on fuel economy.

With my diesel, I typically don't go over 60 or 65mph. But when I make the trek down to Florida once or twice per year I open her up. 25 or 26mpg average over a tank is not unusual for me, but when I change my driving style you can clearly see that my fuel economy suffers significantly. Doing between 79 and 84mph, rapid speed changes, etc. drops me down to 21/22 mpg. If you click the little fuelly picture in my signature it will take you to my fuel economy database.
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  #35  
Old 06-08-2010, 07:57 PM
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Re: My MPG is embarrassing to mention.

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Originally Posted by SvenskaJeepGuy View Post
they are under highway driving conditions
For the GTO guy...these things aren't like the 'goat' as far as minor differences in mpg the faster you go. I *can* get low 20's on the WK IF I maintain a 60-65 mph speed; go 80 and it drops down to mid teens. Obviously the aerodynamics, weight and friction (awd) take their toll versus what you (and I was) used to. City driving can really vary depending on how you drive and being this thing is so over controlled, it's not like you can maximize it easily (like it puts you in the wrong gear, so you have to give it more gas) like with a 6-speed. I do miss my car in many ways

I'm not trying to talk you out of these though. They are nice and have *decent* power (but will feel slow in relation) and do get decent mileage for what they are (except those SRT8's I guess...ouch guys, don't know how you do it. For that kind of mileage, I better be running 10's all day )
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  #36  
Old 06-09-2010, 11:36 AM
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Re: My MPG is embarrassing to mention.

Towing close to max for my 4.7L doing 70-75, I got 12mpg.

Even in city driving with mileage tune or 87 oct performance tune using 89 OCT (stuff with 10% ethanol) I get 15-17. Those tunes on the highway doing 70-75 I get nearly 24.

I have a AFE stage 2 intake, 180* tstat, and superchips tuner.
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