Rapid drop in Gas Milage [Archive] - Honda Odyssey Owners Club Forum

: Rapid drop in Gas Milage

08-17-2015, 01:34 PM
Need a little help. I have a 2003 Ody, with 139K. I am the original owner, and have ensured all the maintenance is done.

In the last three months, I have noticed a distinct drop in my MPG, to the tune of almost 10Mile/Gal. I was getting about 23-24 total, and I am not getting about 14.

-I have checked tire pressure, which was low, but not drastic.
-I have replace all spark plugs, 3 were finger tight, all are now torqued to 21FT-LBS.(this didn't change fuel economy)
-I have check for worn wheel bearings, all seem tight, and I am not hearing dragging.
- I don't believe that my calipers are dragging (even wear on all pads, and on a very slight decline hill, car starts rolling immediately after pulling foot off break with car in neutral).
-Air filter is clean.
-No check engine light, and I cannot hear or feel miss-fires.
-I have put in a fuel system cleaner, no change.

I know that the fuel filter is "not-serviceable" which I take to mean it is inside the tank.

What else could be causing my problem? It has been suggested that I could have a bad MAF sensor, but wouldn't that put off a code?