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Old 06-02-2012, 09:46 AM   #1 (permalink)
Marc F.
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Scooter - '06 Honda Civic EX
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i-VTEC hypermiling


If you have an 1.8 liter i-VTEC engine, like in a 2006 to 2011 Honda Civic, this is the thread for information on hypermiling. Questions and answers go here. This may apply to other Honda engines too, but, VTEC can be used in many different ways.

***EDIT*** If you have a different VTEC stay here! Just specify year/type/no. of cylinders etc. to help people know which system we are talking about.*******

The i-VTEC is a little different from your other VTEC engines. In a nutshell it has Eco cams that activate from 1000 to 3500 rpms when the conditions are right.

BUT WAIT THERES MORE!!! It changes to a unqiue cycle where the butterfly is wide open and the closing of the intake valves now controls the the throttling of the engine. This change is why Honda went with Drive By Wire (DBW). The butterfly needs to flick open almost instantly.

Why the weird cycle? To reduce pumping losses of the engine pulling a vacuum against the butterfly. This engine has other friction reducing features.

To help maximize your mileage keep it in eco mode, I personally started with a light to know when i-VTEC is on, here is a link to that process and a few other links to get you started:

i-vtec solenoid wiring help - 8th Generation Honda Civic Forum

2006 Honda Civic 1.8 SOHC i-VTEC engine

Also a good visual on basic VTEC:

Honda Worldwide | Technology Picture Book | i-VTEC

The thread that started this one.

Original thread


I used to think I was indecisive, but now I'm not so sure .

Last edited by Marc F.; 06-02-2012 at 09:48 PM.. Reason: adding links/ include other i-vtec's
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