I'm still asking for help with the tire sizes. I posted on a Chevrolet Forum and hadn't received any replies:
Tire Size Questions for 1984 Caprice Classic Sedan - Chevrolet Forum - Chevy Enthusiasts Forums
Also, Now is time to figure out what engine heaters to use. I have a "Kat's 13150 1500 Watt Aluminum Circulating Tank Heater" in mind, Pictured below:
Amazon.com: Kat's 13150 1500 Watt Aluminum Circulating Tank Heater: Automotive
What else can be used - I know about Transmission and Oil Pan Heaters but what else is there, If any?
As for Oil Pan and Transmission Heaters, I've heard these Kat's Pad Heaters work pretty well. What do you think of these?
Pictured below is the "Kat's 24250 250 Watt 4"x 5" Universal Hot Pad Heater."
http://www.amazon.com/Kats-24250-Watt-Universal-Heater/dp/B000I8XDFS/ref=sr_1_2?s=automotive&ie=UTF8&qid=1402611444&sr= 1-2&keywords=engine+pad+heater
And I'm thinking, Higher than 25 MPG in this 1984 Chevy Caprice Classic Sedan? Yes we can. I'm also thinking of giving it a new dash cluster, Though not of this type which doesn't have Overdrive:
Gee, What's involved in something like this? These cars did come with vacuum gauges, As you can see on the far right in this photo. (The dash in the above photo is from a 1980 Caprice.)
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.