Replacing cat? Bad mpg

[hckyplya8]

I have a 96 ex coupe, currently getting about 320 miles on a full tank of gas which seems a little low. After research and looking at my exhaust the cat is about 99% rust. Also when my car runs it smells weird I'm thinking its the cat. Is there a high flow cat with the same dimensions as the stock cat that I can bolt in and also I need to pass emissions? Also are there any other causes of bad mpg?

 

[EJackBauer8]

I get 260-330 depending on how I drive, did you ever get better MPG?

Sent from my SCH-I535 using Tapatalk 2

 

[hckyplya8]

No but my friend has the exact same car with almost the same mods and he gets 400

 

[crash!]

Any CELs/history codes? I would take a look at O2 sensor readings. Those would be your telltale signs of catalytic converter failure.

 

[2slo4u]

could just be the driver..i thought WI didn't do emissions...?

 

[gugiey]

Tune up, fuel system service , spark plugs./wires . Can all improve gas mileage .

But I don't mean cheap fuel system cleaner I mean dealership quality

 

[EJackBauer8]

Your friend is probably hypermiling.

 

[Billy.]

320 on a tank is not bad. I wouldnt be concerned with it. If you were below 300 regularly you might look into doing some tuneup items.

 

[hckyplya8]

Also as I start to get low on gas when I go to start my car it takes longer and longer to start. It starts once I'm at about 1/2 tank

 

[hckyplya8]

could just be the driver..i thought WI didn't do emissions...?

And Certain parts of WI don't do emissions. I would have to go register my car like 3 hours from where I live in order to not have to worry about it

 

[EJackBauer8]

Also as I start to get low on gas when I go to start my car it takes longer and longer to start. It starts once I'm at about 1/2 tank

Yea mine does that too when I'm full it takes me one crank to start when I'm near empty and parked uphill (my driveway) it takes about 5-6 cranks.

 

[hckyplya8]

Ok I wasn't sure if that was uncommon or not

 

[faztec1]

Change your fuel filter, plugs, wires, cap and rotor. See what that does.