Well I was telling my Uncle about my Grandma's Ford Cortina (if your wondering why they don't know each other -- they do but their on different sides of the family but rarely meet)

Anyways I was telling him how awesome it would be to have one but the fact that it's a 3.0L would be uneconomical for a "student". He then told me (while under the influence of alcohol) nonsense, we'll tune that car so that's it's mwa.

He then proceeded to make a circle with his thumb and index finger, kisses them like a french chef would and continued drinking.

But family introductions aside, is this really possible?

"Tuning" a 3000 cc engine so that it consumes less fuel? I mean the fact that it's an older engine doesn't really help even if it's possible.

And if it is I doubt it wouldn't have drawbacks such as reduced engine response or speed otherwise everyone would be doing it.

But I have little to no experience with engines so I'm asking you guys.

Thanks in advance.