> those are highway miles. I get about 18 to 21 mpg depending. My in-town
> mileage is considerably worse and I have a light foot. Got 12 mpg on
> this last tank.

I'll re-check. I went through a massive
tuneup/inspection/try-this-try-that back in 2008 to find out why my
highway mileage was about 14 mpg. Tested and adjusted everything,
pestered the list a lot. Turned out to be the ECU. Swapping it with
another yielded my present 18-21 mpg highway. Well, sometimes as low as
17 mpg, depending on conditions. But usually better. And that has been
holding, so I don't think there is something "seriously wrong" here.

But I'm going on a trip up to Clatsop, Ore., later this month, a round
trip of 500  miles, mainly highway so I'll re-check that. Another
in-town fillup will tell me whether I am indeed getting 12 mpg in town,
or made an error when I did the last tank. Like maybe we've been running
ethanol-diluted gasoline at the pumps right now during winter and I
wasn't paying attention.  There's a station on highway 97 in town that
advertises ethanol-free premium. I know I don't need premium but having
undiluted gasoline would probably make a bit of a difference.

So many factors, so few brains.

--
Rocky J Squirrel