Zate,
You have the right idea just the wrong implementation!

I too also hated what the STi was costing gas wise and made the decision a longgggg time ago to get a gas sipper. Like one year after getting the STi.

But I kept the STi.
I've "upgraded" from my 93 Accord 5 speed I bought 3 years ago to a 93 Civic Vx hatch. That thing is GREAT on gas.

A 15 year, gasoline only car, rated at 45 city, 56 highway!
The best part is the "challenge" of getting as good a mileage as possible. I still don't have it tuned right but it gets high 30s low 40s in town or on the highway all day long. Best I ever did was in town, shutting off at lights (when the weather was nice). 50 mpg. Take that Op*ick, I mean Opec!
The best part? The dichotomy. After going from a 2044 pound, 93 hp, 1800 rpm shifting putt putt to the 3400 pound, 370 hp, shift at 6500 rpm beast is a BLAST!
Anyway, glad to hear you're going to get back in it eventually.
Btw know the other way to really stick it to Opr*ck? Bicycle. Did you know the human body on a bicycle gets the combustion engine equivalent of 300 mpg????

And zero emissions to boot! Well as long as you're not eating Mexican as fuel. lol