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I have alot of experiance with hondas. I had a DX crx, sold it to get a 98 DX civic hatch. Anyways. You dont need vtec, or to ever worry about it or hook it up. They say you need to hit it every 5000 miles or so so it doesnt gunk up the vtec oil passage. but! if you dont ever want vtec (and lower gas milage) then dont hook it up. You motor still has more power than a stock si without it.
The HF or DX tranny is what you want for gas millage, or a 5th gear swap from one. The HF is better. I dont see any reason why you wouldnt be getting 45-50 mpg combined after a tranny or 5th gear swap.
Again this is just my 2 cents
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