recent poor fuel mileage

[haileyn1]

my 91 Q45 has been getting 21 MPG like clockwork for the last 8 years i have owned it. but just in the last month it has dropped to 13.3 MPG over the last 3 tanks of fuel. I have not changed the grade of fuel (or even the brand for that fact). anyone have an idea what may cause something like this? car has 150K on it now.

[elwesso]

Have your driving conditions changed??? From 20 to 13 is a drastic move, but I get about 13 city in my well maintainted 94.....

From 20 to 18 or so woudl be more believeable... Does the car run rough or anything... Theres something that has happened that should be very noticeable for it to drop off the wall like that.....

[haileyn1]

no, thats the odd thing. i drive the same route (work, school, church) that i have for years. this last tank was almost all highway driving and i got a little better 14.9 MPG, after filling it today. i had been getting ~325-350 miles on ~16-17gal, but not im getting 225-250. and this just started about a month ago.

the car does not seem to run rough or idle higher than normal. even our mechanic here has no idea other than to tell me thats what i get for not buying american. one recommendation was possibly the O2 sensor?

also, does anyone know how do i go about getting my password reset to my original login when the email i set it up on is no longer valid? (user name haileyn)

[AlabamaDan]

You could try running a can of BG44K through your tank. It's done wonders for my car.

As far as resetting your old password, maybe PalmerWD or AZHitman could help.

[elwesso]

the o2 sensors can only do so much... with completely shot o2s and everything else as normal, you should still be able to get 18

Another thing to check would be the MAF