Yeah I never have any hard data to back it up but I do always run it through the gears WOT once a day at least to keep the ECU on its toes. Call it superstition, whatever lol

 

Its better to maintain a constant driving style. Then the ecu can properly do its minor adjustments for better overall efficiency.

Im random as hell when driving, so my ecu is constantly "trying" new things. Sometimes its really peppy, other times it seems to hang in the shadows waiting for my next move lol

 

I found something from Honda that recommends premium gas in the L1.5. They recommend premium because of the compression ratio. 2013 ILX - Powertrain - Honda.com

I Know it says hybrid and dual spark engine but all Honda motors has high compression.

 

Yes, Honda is clearly showing a willingness to recommend premium fuel where they think it's appropriate, such as in the three engines on that page.

 

The science of cpmbustion depends on a number of factors as well as compression ratio; the shape of the combustion chamber, valve disposition, the sequence of igniting the atomized fuel and the composition of the atomized fuel are just a few.The engines referenced are the newst Honda hybrids and used in the Accord. A recent Automotive News reprted Honda anticipates 50 mpg highway and for a large sedan like the Accord thats spectacular economy.
So its unfortunate that premium fuel is recommended; that concludes that the hybrid then would be no more economical than a regular Accord on a dollar basis. Perhaps Honda has determined that gas with ethanol is not very anti-knock abnd thus for bestperformance prmium gas is necessary to avoid knocking. Its somewhat accepyted that premium gas has little if any ethanol.
In any case just because Honda recommends Premium for the Accord hybrid is not reason to assume all Hondas should use premium; the difference in a staggered - 2 spark plug - firing order and a single plug firing orderis enough to keep from saying they are alike.

 

Going back to the oil first. 0w20 is OK to use in the Fit and all Honda motors from 2001. 0w20 is basically a 20 weight oil that flows at cold temp better than the 5w20, Both are OK to use but I prefer the 0w20. Keep the level full at all times which means adding oil when needed to replenish additives.

Having a Hybrid car should lower the octane requirement because the electric motor lowers the loads at slower speeds. I never said Honda Fit could not use regular but looking at the mpg and other problems the cost is more to use regular. I've always gotten better mpg and power even in the winter on premium gas. My new Honda I am easily getting 60 plus mpg on the highway and averaging 41 mpg and its not a hybrid.

Here is something from Honda about the ecu and how it works. Keep in mind the original patent is from 2006 and this is the update. http://images3.freshpatents.com/pdf/US20130186380A1.pdf

 

2007 Honda Fit Powertrain - Honda.com

 

Nice article on the Fit engine and transmission. But it still doesn't refer to using synthetic oil or premium fuel. Of couse 0w20 synthetic oil can replace 5w20 oil and the car will run just fine on premium fuel. It just costs more money for a very, very small return that is not proven and only theoretical at best. If it makes you feel better than enjoy yourself.

BTW since I started this thread the oil level has not gone down any amount that's perceptible with the naked eye.

 

So not true it has been "proven" by data submitted by scan gauge owners that using higher octane results in advanced ignition timing.

 

..............

 

Interesting in that most high performance engines in the past reduced the static ignition timing as the octane rating increased. And the ignition maps I have seen only reduce timing when knocking occurs.

 

The fit does reduce timing at knock BUT it also increases timing over less octane UP TO the knock point when using higher octane.

One could say it's standard operating principle is to adjust timing as high as it will stand up to knock then hold it at that point no matter what the octane is.

Therefore you always get more advanced timing using high octane because it detonates at a higher point before knock.