35 mpg?
 

so my 2009 civic hybrid with 59k miles only gets around 35 mpg no matter what I do. I have new 0w20 Mobil one oil change, cvt fluid changed, tires are good and at 38 psi, new 12 volt battery. I drive slow and use cruise control as much as possible in city and highway. No matter what I do I can't seem to even reach 38 mpg. Even with ac off in the morning it still cannot reach the average reported by lost folks. I do see fluctuations in ima charge several times when I drive the car. I set cruise to 60-62 mph on highways and that helps bring it up to 37 mpg but that's about it. Anything I should inspect?

Re: 35 mpg?
 

Your hybrid battery is severely deteriorated.

The IMA SoC gauge behavior you are observing is recalibrations. They kill mileage. Unfortunately, the revised battery management can cause this to continue for a very long period of time.


A negative recal occurs at 0;25 the moment assist is given. Gauge "marches" down at 1 bar per second to 2 bars with forced charging.

A positive recal occurs at 0:42 where charging stops, and the gauge "marches" at 1 bar per second to 8 bars.

This is a sign of a severely imbalanced battery.

Start documenting each and every recalibration (if you see only 2 of 8 bars, you're almost certainly in a recalibration). Document your gas mileage, speeds, and driving style.

Contact Honda corporate and describe this behavior.

ALL 09-11 HCH2 had their battery warranty extended to 10yr, 150K miles in ALL STATES.

Re: 35 mpg?
 

Keith,
im the second owner and original owner had the ima pack replaced under warranty overseas in 2013. Does that mean I'm out of luck or does the warranty still applies?

Re: 35 mpg?
 

If it's a US car, it should be covered.