Great response. Yes I have invested many many hours researching this fine site. My car is at 100k now on a French sold gen 2, 2010 EX. The mpg has fallen from 46 combined to now 38 in 10k driven (over 9 months). It is a gradual decline each month and now at 38, I'm to the point to either fix or sell. Since I live basically 10 miles from Russia with no servicing dealer to turn to, and most parts here are fake...b4 I start a tear down I need to be darn sure I have parts, details and all my ducks in a row. Authentic Honda dealer parts are an 8 hour drive form me, one way. And with no dash lights or OBD faults...here we are.
Now, for many years by trade I was the regional ecomm director for a major Japanese oem and know that (ask a tech) is the #2 page hit after schedule an appointment. And since this is a thread driven arrangement here...and I haven't seen much specific and detailed gen2 drivability (concrete fixes, advice in terms of say a suspect o2 sensor needed at 100k) type detail, I figured it was time to start a thread to address detailed techie at 100k.
If not, my bad.
Please show me what you best recommend as your breadth of experience here clearly eclipses any thing I have come across so far.
Many thanks in advance,