im getting better millage in my 88 sse.. its giving me about 350-400 miles per tank now as opposed to my 95 only giving me about an average of 250 miles per tank? any ideas/

First suggestion...stop trying to compare "tanks" and calculate the actual mileage. If the gauge is off and on one car your 300-400 miles is 17 gallons versus the 250 miles being 13 gallons..that can be almost the same mileage when calculated.

It'* been my experience that when you're dealing with vehicles that are up to 14 years old, they need complete service and or replacement of certain fuel system parts. Now I've only been driving my SE for a few days now, but when it came to my 93 Lincoln Mark VIII, I was getting 16mpg. Roughly 200 miles per tank. I did a complete fuel system change. I replace the fuel filter, fuel pump and fuel pressure regulator together. I also took out my fuel injectors, cleaned and replaced the orings. After I did this, my Mark shot up to 25mpg on the highway and 20mpg in the city.

20 city / 25.5 highway. I have no idea how that works out

[quote]Posted: Thu Jul 19, 2007 8:11 am Post subject:

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im getting better millage in my 88 sse.[quote]


don't try to get the same mileage than a Ln3 whit a L36 i had 2 LN3 and they where the besst 3800 for mileage

It is nice to swap all the fuel system items...although it would be costly. Having worked with a mechanic for years now, I've adopted the philosophy of testing if possible and only replacing the worn, broken or maintenance parts to keep costs down.

That is a hellova jump in mileage. I found me one on SparkPlugs.com. $36.75 + $8 shipping. Sure beats $58.99 at AutoZone !!!

I was just watching Motorweek, and Pat Goss was talking about fuel economy and what could cause bad fuel economy. Most of this we know already. They are:

1. Check tire pressure regularly. Set to specifications set inside the door.
2. Clean fuel filter
3. Good spark plugs
4. Inlet air temperture sensor.
5. Mass Airflow Sensor (And not to look for codes, because they can be out of spec without setting codes)
6. Bad Coolant tempertaure sensor
7. Bad Thermostat (Makes the car run too cool, or makes the computer think the car is running cooler than it should.
8. Thicker oil is not always good
9. Bad battery (Which makes the alternator charge more, consuming more power)
10. And all the junk in the trunk

QFT !!

In my F150 you can even see the difference when running the hvac fan on high with no ac...
you start measuring by blocks per tankfull when you have the ac on max and the fan on high! LOL

I've never noticed the same thng in the Olds, to me it seems like it get better mpg with the ac on.