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Hex · 03-07-2013, 11:49 PM

I have a manual '97 Civic HX with 151k miles. Im currently considering a fuel system cleaning and/or injector upgrade. Ive read mention of upgrading from 1 to 4-hole injectors for better fuel delivery, but Im unclear as to whether any increase in injector CCs will improve or decrease fuel efficiency.

For the record, I'm currently achieving roughly 34mpg doing mostly city driving, which is about 4mpg less than the factory rated 38mpg city. The engine is mostly stock excluding a Magnaflow header/cat combo, K&N air filter, & '02 RSX Type-S muffler. I'd like to maximize my MPG and at least average around the stock ratings. Your suggestions will be appreciated.

03-07-2013, 11:49 PM	#1 (permalink)
Hex EcoModding Lurker Join Date: Feb 2013 Location: Mid-FL Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	Injector CCs & MPG Increase I have a manual '97 Civic HX with 151k miles. Im currently considering a fuel system cleaning and/or injector upgrade. Ive read mention of upgrading from 1 to 4-hole injectors for better fuel delivery, but Im unclear as to whether any increase in injector CCs will improve or decrease fuel efficiency. For the record, I'm currently achieving roughly 34mpg doing mostly city driving, which is about 4mpg less than the factory rated 38mpg city. The engine is mostly stock excluding a Magnaflow header/cat combo, K&N air filter, & '02 RSX Type-S muffler. I'd like to maximize my MPG and at least average around the stock ratings. Your suggestions will be appreciated.