RE: WOW...what a MPG improvement!!!! (Full Version)

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RE: WOW...what a MPG improvement!!!!

khoolhandz -> RE: WOW...what a MPG improvement!!!! (2/9/2007 7:16:37 PM)
quote: ORIGINAL: importkiller my compression is fine, checked that already. truck runs great and is actually faster than my buddies identical 06 h3. I pull him from the line and in 1/4 mile strip I beat him by at least 5 lenghts every time. I know the problem is in my PCM tune, somehow someway a tech at the dealership had to be playing with it....but they keep telling me that it because I'm running 35's, even though I was getting 11 mpg with the stock base 265's. Last dealership told me they can't reflash the pcm to stock....technology isn't available yet for the h3....I didn't tell him I was a gm tech...just laughed in his face. I'm going to send it out to pcmforless.com and have tehm look at it and correct. Pretty sad that a I5 is getting worse mileage than a worked 350 SB would get. I am thinking that something in the cooling system culd be bad, causing the truck to run constant coolant so the motor runs like it is always cold...which burns more fuel. Kinda like having the choke open all the time on a carb motor. Umm, I thought your wife drives the H3? I think that's the problem![8D]

importkiller -> RE: WOW...what a MPG improvement!!!! (2/10/2007 1:07:31 AM)
my wifes drives it to work in the am...I drive it in the pm. Until I get my truck in 15 hours we are a 1 car household....not including my JGC but thats in the rebuild faze still.

JM -> RE: WOW...what a MPG improvement!!!! (2/11/2007 3:03:03 AM)
Buddy, this MPG problem is really bad.[:@] Why don't you try to put some sugar in your gas tank and find out if your engine is less thirsty whith a ''sweet'' gas hmmm? Another idea could be that you become ''buddy-buddy'' with some koweiti oil producer (after all, you guys saved their butts back in '91) and ask him to send you half a VLCC at a discount price. Sorry, Import I could not resist[&:][8D][:D][:D][:D][:D]

Linus Gump -> RE: WOW...what a MPG improvement!!!! (2/11/2007 10:18:13 PM)
IK have you thought about putting stock sized tires on it, driving it for a couple of tanks, and taking it back to the dealership to show them it gets poor fuel economy on it's own? I'm sure a local tire shop would have some used tires you could get for cheap just for the experiment.

Stryder -> RE: WOW...what a MPG improvement!!!! (2/12/2007 9:02:24 AM)
I just filled up on Sunday, and I had driven half city half highway. Now, to credit the Hummer a bit, it's been nasty cold out here (-20'C to -40'C ish), so I think that may have contributed a bit. This last tank, I put in 76.74 litres (20.30 US Gal, or 16.903 UK Gal). I travelled 404 KM (251 Miles). That makes my mileage 12.36 US MPG, or 14.85 UK MPG. All stock on my H3.

importkiller -> RE: WOW...what a MPG improvement!!!! (2/12/2007 3:09:48 PM)
Linus..... I asked teh dealer about that because I still have my stock rims/tires sitting in my shed. He said that if I wanted to put them on and bring it in with a full tank of gas that they would drive it for 1/2 a tank and refill to see where the mpg are at, but.... depending on how busy it is it could take anywhere from a week to 2 weeks. This was the same answer from all three dealerships within 50 miles of me. I'm not at the point yet where I am that concerned overr it to let them have my truck for 2 weeks so a tech can do god knows what with it while he burns 1/2 tank of gas. I have a call into gm though about it...my gripe is the dealerships won't even run the pcm through a programmer to see what the settings are...damn I know it can be done, we did it all the time when I was a gm tech. Hopefully the regional service manager can get at least taht done for me.

Linus Gump -> RE: WOW...what a MPG improvement!!!! (2/12/2007 10:08:44 PM)
That sounds like you would wind up getting the used end of the stick on that. I envision mechanics and parts people running all over town picking up parts from vendors, and taxiing people around, at your expense. It would seem to me that they could plug a scan tool into it and drive it around the block while monitoring fuel flow

Dennis -> RE: WOW...what a MPG improvement!!!! (2/12/2007 10:10:56 PM)
I'm betting that, for some reason he has oversized Injectors.. Take it away

importkiller -> RE: WOW...what a MPG improvement!!!! (2/13/2007 12:17:11 PM)
that what my wife said too....oh never mind...different type of "injector"[;)][;)][:D][:D]

RutDogg -> RE: WOW...what a MPG improvement!!!! (2/13/2007 12:45:40 PM)
[image]http://us.i1.yimg.com/us.yimg.com/i/mesg/emoticons7/33.gif[/image]

sartec2 -> RE: WOW...what a MPG improvement!!!! (2/13/2007 9:33:05 PM)
PCM tune......... How much did that set you nack? How muchwork is involved? Gracias in advance.

RutDogg -> RE: WOW...what a MPG improvement!!!! (2/13/2007 9:37:24 PM)
quote: ORIGINAL: sartec2 PCM tune......... How much did that set you nack? How muchwork is involved? Gracias in advance. There's quite a bit of info here: http://www.hummerforums.com/m_25589/mpage_1/key_/tm.htm You can also go to www.pcmforless.com.

HummerGuy -> RE: WOW...what a MPG improvement!!!! (2/14/2007 8:51:21 AM)
quote: ORIGINAL: sartec2 PCM tune......... How much did that set you nack? How muchwork is involved? Gracias in advance. Check out the threads on the forum. To make a long story short, it's not a whole lot of work, and the results are awsome. It feels like you are driving an entirely different car. The pickup is better, the mileage is better, and the overall power is better. It's definintely worth the time and money.

sartec2 -> RE: WOW...what a MPG improvement!!!! (2/14/2007 1:37:06 PM)
Cool. Thanks for the insight.............Rutt.....I always have a hard time reading your posts. I can't figure out why? [sm=bangbang.gif]

RutDogg -> RE: WOW...what a MPG improvement!!!! (2/14/2007 1:39:25 PM)
quote: ORIGINAL: sartec2 Cool. Thanks for the insight.............Rutt.....I always have a hard time reading your posts. I can't figure out why? [sm=bangbang.gif] I don't know....is there something distracting you?[:D][:D][:D]

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