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Originally Posted by NHRABill
Hey Fjasper the curb weight of the DeVille is what is killing it. its probably 4,000lbs at least all that leather and steel and not much you can do without ruining the car. My wife has the SRX AWD 4.6 N* v8 and given the right circumstances can net mid to upper 20's on highway easily. problem is around town  it sucks cause the weight is over 4500lbs.
I love love love the Caddy its a monster cruiser with the 5spd overdrive trans. Not sure what your parents has but if it is the same as my wifes 2004 keep it over 45mph but under 65 and you will net great mpg fro a vehicle its size and weight. As far as head gaskets goes 140,000 miles on my wifes car and no issues yet bought car second hand 2nd one she has had 1st was the v6 2wd but the v8 AWD is so much more fun and if you are practical driver can net same mileage.
Suggestion Pay attention to tires and turn the mileage gauge on inside the car so they can see how they are doing as they drive and what they average its a built in scan gauge  Cadillac has had them a long time my 91' coupe deville had one way back when. |
They usually use a smaller car to go to the post office, etc., so this sees mostly highway miles. My mom drives faster than my dad, but they discovered the mileage display, and they're having fun trying to keep the mileage up, so they've both slowed down a little from the old days. They brag about the mileage they get, so they must be channelling their inner hypermiler.
I see the claimed Cd is 0.35, and it doesn't have a smooth lower engine cover or an airdam, so it looks like there's room for some easy improvement. I'll throw in some coroplast and aluminum flashing when I go up to their place this weekend, and see what I can whip up. We're putting new front rotors on it, so it'll be up in the air anyway.