1997 5.7 only 9 mpg

Caman96 · Nov 24, 2021

PlayingWithTBI said:
I don't care what mileage I get as long as I get where I'm going in less than 14-1/2 seconds

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travis mattson · Dec 22, 2021

Well I'm down to 7 MPG. Repleaced downstream o2s about 800 miles ago, runs great just **** mileage, I had 300 mile a road trip and got 14mpg on 91 non ox fuel. driving extremely easy and 65.
I changed the air filter to a standard filter had a wix heavy duty air filter in from this summer. Maybe that will help.
Plugs look perfect. Consider ans tire change now

Schurkey · Dec 22, 2021

travis mattson said:
Well I'm down to 7 MPG.

Entirely normal for fuel economy to decrease as the temperature drops.

Let me guess: It's colder now where you are, than it was when you started this thread.

travis mattson said:
Repleaced downstream o2s about 800 miles ago, runs great just **** mileage,

Downstream sensors wouldn't affect fuel economy. Upstream sensors can.

travis mattson said:
I had 300 mile a road trip and got 14mpg on 91 non ox fuel. driving extremely easy and 65.

Yeah, seems low.

travis mattson said:
I changed the air filter to a standard filter had a wix heavy duty air filter in from this summer. Maybe that will help.

Unless the HD filter was getting plugged, I wouldn't expect this to make a bit of difference.

travis mattson said:
Plugs look perfect. Consider ans tire change now

Have you ever put a timing light on the thing, to assure that the electronic spark advance is working?

travis mattson · Dec 24, 2021

I replaced the air filter with a standard size filter and gas cap and got 15.2 on highway 60 65 mph

1997 5.7 only 9 mpg

Caman96

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travis mattson

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Schurkey

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travis mattson

OBS Enthusiast

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