1997 sts, 9.8mpg?

Reply Subscribe

Thread Tools

Search this Thread

Jan 26, 2010 | 12:58 AM

wildkat_X

Thread Starter

Junior Member

Joined: Jan 2010

Posts: 2

From: Sault Ste Marie, Ontario

1997 sts, 9.8mpg?

Hey all; I have a 1997 STS.

New Platnum +4 plugs, new FPR, new 02 sensor.

Always 91oct. Fresh fuel filter too. What on earth would cause 9.8MPG??

No hesitation at all..runs smooth. no overheating or anything.

Jan 26, 2010 | 07:51 PM

Stealth

Super Moderator

Joined: Feb 2007

Posts: 3,945

Quote:

Originally Posted by wildkat_X

Hey all; I have a 1997 STS.

New Platnum +4 plugs, new FPR, new 02 sensor.

Always 91oct. Fresh fuel filter too. What on earth would cause 9.8MPG??

No hesitation at all..runs smooth. no overheating or anything.

running in low gear.
pull codes

.

Jan 27, 2010 | 04:38 PM

cadsts

Junior Member

Joined: Dec 2006

Posts: 9

From: new york

perhaps a heavy foot and going up hill!

Jan 27, 2010 | 04:42 PM

cadsts

Junior Member

Joined: Dec 2006

Posts: 9

From: new york

If you are going up hill and the incline is steep. I could see that kind of m.p.g. when you recorded that info. were you on flat ground?

Jan 27, 2010 | 06:39 PM

stomper

Tech Certified Members

Joined: Jun 2007

Posts: 2,701

parking brake on?

running on ethanol ?

timing off, wayyyyyy offfff......

Jan 28, 2010 | 01:38 PM

wildkat_X

Thread Starter

Junior Member

Joined: Jan 2010

Posts: 2

From: Sault Ste Marie, Ontario

Flat ground, no heavy foot. Driving normal! Always running 91oct. Tires might be 1-2psi under inflated, but I coudltn see that giving me the same milage as a 3 tonne 7L Hummer? Any sensors I should look at? I dont think this is a simple "change your air filter" or "Dont goose 'er " kinda thing here.

No codes are up, I pulled them the other day, then cleared them all, so far nothing new.