Re: Mileage down
Plugs and or wires would be my best guess then. THey are Platinum plugs and
they should last 100 000, but I changed mine at 50000/
You may not like hearing this but I have a 97 Explorer 4.0 sohc with 97000.
I get 19/21 city and almost 23/24 highway. "Brother, it ain't no joke". I
always did get pretty good gas mileage and I have always used 87 octane, but
the "secret" is the oil and filter (as far as I'm concerned that is) I use
Mobile One oil and a K&N oil filter.LIke I said I changed my plugs at 50
and I have cleaned them since. Every month I will put in one bottle of 104
octane ( I feel ) It does a good job of keeping the system cleaner. I also
(like you) am religious about maintenance, tires/pressure/align, ETC.
A sensor could be going up (I think, don't hold me to this) and that might
cause a drop in mileage, But chasing it down is like finding hens teeth,
until it goes completely or enough to trigger a DTC.
Good luck and let us know how it goes.