Rear gear\Tune help!

bigjohnstud4200 · January 2nd, 2012, 03:16 AM

Originally Posted by XxstarspyXX

Oh wow i thought the lower RPMS = better gas mileage

It's a combination of RPM + load, and probably other factors.

Green_6er · January 2nd, 2012, 11:35 AM

if i shift at 2k rpm and i keep it under 2k the whole time, i get 21 mpg. if i shift at 2.5k - 3k i get like 23 mpg. it's wierd, i know. so if i shift at 5.2k everytime i should get like 30+ mpg????

Six Banger · January 2nd, 2012, 12:08 PM

Are you driving through a city? I get 22-23 around town and up to 30 on the highway at 60mph.
When was the last time you changed plugs and filters? And are you calculating your MPG on your mileage you got from the 3.73 tune or from when you reset it?

bigjohnstud4200 · January 2nd, 2012, 01:30 PM

Originally Posted by Green_6er

if i shift at 2k rpm and i keep it under 2k the whole time, i get 21 mpg. if i shift at 2.5k - 3k i get like 23 mpg. it's wierd, i know. so if i shift at 5.2k everytime i should get like 30+ mpg????

I generally don't shift until at least 3k, and usually around 3500 - 5500 depending on how lead footed I am feeling and I get 20MPG in the GT in the city and 25 on the freeway.

XxstarspyXX · January 2nd, 2012, 01:34 PM

Originally Posted by Six Banger

Are you driving through a city? I get 22-23 around town and up to 30 on the highway at 60mph.
When was the last time you changed plugs and filters? And are you calculating your MPG on your mileage you got from the 3.73 tune or from when you reset it?

i got 13-15Mpg when i had the 373 tune on, i would travel 20 miles a day on the highway, so its mostly highway miles.

And my plugs and filters were changed like 4 months ago

Six Banger · January 2nd, 2012, 05:27 PM

Something is wrong if you get that bad of mileage on the highway. Did it run like that before the tune/did the PO have a tune on it?

XxstarspyXX · January 3rd, 2012, 01:56 AM

Originally Posted by Six Banger

Something is wrong if you get that bad of mileage on the highway. Did it run like that before the tune/did the PO have a tune on it?

Yeah it ran bad also before the tune...Funny thing though,( I dont get this AT ALL). I went on a 100 Mile trip once and I got like 30MPG that trip

xtreme 2 · January 3rd, 2012, 09:31 AM

I would go through and check the plug gap, check the fuel filter, check the air filter, test the coil pack, just to make sure everything is efficient.

Gears won't cause that big of a difference, even 4.10s should be better than that.

January 2nd, 2012, 12:08 PM	#23
Six Banger Hardcore Enthusiast 2001 - 3.8 Join Date: Jun 2010 Location: Massachusetts Posts: 2,978 iTrader: 1 reviews	Are you driving through a city? I get 22-23 around town and up to 30 on the highway at 60mph. When was the last time you changed plugs and filters? And are you calculating your MPG on your mileage you got from the 3.73 tune or from when you reset it? __________________ Look on the bright side: If you're reading this, you're alive. And that's fucking awesome.

January 2nd, 2012, 05:27 PM	#26
Six Banger Hardcore Enthusiast 2001 - 3.8 Join Date: Jun 2010 Location: Massachusetts Posts: 2,978 iTrader: 1 reviews	Something is wrong if you get that bad of mileage on the highway. Did it run like that before the tune/did the PO have a tune on it? __________________ Look on the bright side: If you're reading this, you're alive. And that's fucking awesome.

January 3rd, 2012, 09:31 AM	#28
xtreme 2 Hardcore Enthusiast 2001 v6 premium Join Date: Nov 2008 Location: Tulsa, OK Posts: 1,340 Blog Entries: 1 iTrader: 0 reviews	I would go through and check the plug gap, check the fuel filter, check the air filter, test the coil pack, just to make sure everything is efficient. Gears won't cause that big of a difference, even 4.10s should be better than that. __________________ Screw it, coming to play with the big boys... 5.4L Vortech COMING SOON!

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