Quote:
Originally Posted by 101Volts
I'm still asking for help with the tire sizes. I posted on a Chevrolet Forum and hadn't received any replies:
It's been suggested that I override the air-pollution equipment on the car for higher fuel efficiency. Does this work? I don't have smog tests where I am now.
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For tire size put on whatever fits and matches your load requirements, those cars like the buick roadmaster seemed to be flavor of the day tire sizes.
You could look in the manual or on the options placard usually in the glovebox to figure it out.
In the end on a v8 its probably a wash whatever size you throw on there, on ours its seemed to be 225/75r15's that fit nicely.
Also defeating the pollution equipment has basically no affect on fuel economy in your case. Main reason people do it is because they don't want to buy a cat.
The only way I could see a "Defeat" actually doing anything would be to figure out how to lean out the car and likely your emissions would be better afterword anyway.
Cheers
Ryan