driving a 5 speed

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03-06-2013, 06:48 PM

#21

SXGT

5th Gear Member

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Join Date: Apr 2004

Location: CA

Posts: 3,023

Quote:

Originally Posted by 1slow67

I don't think so

everything i have ever seen or read or heard has suggested to me that manual transmissions get better MPG than Automatics which are heavier, hotter and lose a greater % power.

but my 1997 had a 2.73 rear end. this new one has a 3.27 ? something like that? still,. 12MPG with mostly highway miles is unacceptable, even if i had 3.73s and 400hp

http://www.consumerreports.org/cro/2...sion/index.htm

Last edited by SXGT; 03-06-2013 at 06:54 PM.

03-06-2013, 07:51 PM

#22

Fryguy22

4th Gear Member

Join Date: Aug 2005

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Posts: 1,817

Quote:

Originally Posted by SXGT

I agree. You should be getting way better mpg. Try basic maintenance. How's the air filter look? Has the fuel filter ever been replaced? Spark plugs? Clean your injectors. A tuner might help as well.

03-06-2013, 08:05 PM

#23

SXGT

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Join Date: Apr 2004

Location: CA

Posts: 3,023

ive not had the car long and weather has been a factor in me not getting anything more than an oil change done. it has a K&N filter, do i need special oil to clean it with?

03-06-2013, 08:26 PM

#24

Stevo86

3rd Gear Member

Join Date: Nov 2012

Location: North Carolina

Posts: 574

Quote:

Originally Posted by SXGT

I am going to see if my gas gauge is faulty but seeing what numbers show up on my next fill up. Last time I got gas it was from less than a 1/4 tank and the gas pump shut off at 8 gallons.

Someone may have said this, I didn't read far enough. But you have a 15 gallon fuel tank. If it only took 8 gallons from less than a 1/4 odds are your sending unit is reading improperly.

Try this. Fill up, drive 40 miles. Fill up again, you should have burnt about 2 gallons of fuel. That will give you a good idea whether or not this thing is really sucking down fuel like it's cool.

03-06-2013, 09:18 PM

#25

FlamingoGT

2nd Gear Member

Join Date: Sep 2009

Location: Jax FL

Posts: 442

Mileage on mine sucks. I get as good with my truck, and it is a heavy 4x4. Back in the day I had a 90 GT 5.0 auto, and it got a lot better than my 04.

But I do agree with what Stevo said above... 8 gals should be just shy of 1/2. Try filling it up, driving a set number of miles, then fill up again... don't go guessing until you fill it back up as that should give you a better idea of how much gas you really did use.

03-06-2013, 09:34 PM

#26

BraMas

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Join Date: Jun 2005

Location: Holland, MI

Posts: 4,634

Quote:

Originally Posted by Dooney

they will definitely affect performance. They are constantly sending signals to the ecu to tell it what it should be doing with the fuel trims. I would check your air to fuel ratio and see how far off it is from stoichiometric (14.7:1)

No they dont!!!!!!!!!!!!!They monitor what the cats are doing they do not adjust the ECM in anyway.

03-07-2013, 12:28 AM

#27

SXGT

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Join Date: Apr 2004

Location: CA

Posts: 3,023

Quote:

Originally Posted by BraMas

No they dont!!!!!!!!!!!!!They monitor what the cats are doing they do not adjust the ECM in anyway.

i hope so!

03-07-2013, 12:42 AM

#28

Risky guy

Join Date: Mar 2013

Location: New York

Posts: 12

Quote:

Originally Posted by Fryguy22

I agree. You should be getting way better mpg. Try basic maintenance. How's the air filter look? Has the fuel filter ever been replaced? Spark plugs? Clean your injectors. A tuner might help as well.

+1
Have you cleaned the throttle body can get gummed up & really affect mileage.
When I had my gt , by 30k tb was covered in oil and some gunk.

Removed the by cleaned it up , car drove like a million bucks.

Gas mileage improved & no idle issues.