My bet would be on the oxygen sensors at that age and mileage. They can
go bad over time without throwing a code, IMHO.

Are there any codes?

My 0.02.

dan

On 6/24/2012 7:44 AM, Slim wrote:
> I have a 2000 Honda Accord with ~200k miles and I've noticed lower gas milage the last few months. It would be great to get some ideas on what could be happening from this forum. I am seeing about 19 mpg with 30% highway and 70% city driving.
>
> The EPA estimates the car should get 26 highway / 21 city. From 2002 to 2006, I kept very meticulous records and I averaged 22mpg for those years very consistently. My driving at the time was about 70% highway and 30% city. Not great but expected.
>
> Last summer I noticed the gas milage goto 16 mpg. I has the spark plugs replaced and a coil and the car seemed to be working fine where I was getting 25 mpg highway.
>
> Since, last fall something has occurred where I am not getting about 19 mpg hybrid again. I'm a bit puzzled as to why. Some history.
> 1. Spark plus and one coil replaced at 190k
> 2. Timing belt replaced at 110k, so wearing but should still be good for another 10k miles or so.
> 3. Air filter replaced at 150k. Overdue for replacement but I read that with fuel injection this should not cause a big hit to MPG. Have ordered the parts for replacement.
> 4. The EGR kit was done around 150k.
>
> Can anyone suggest anything else I should look at when trying to debug this reduced milage issue?
>
> Thanks,
> Are there
>