Question about unusual fuel consumption

[e30]

Hey I have a 1991 318is w/ 183k, and I have always used 93 oct. Lately, I have noticed I average around 110 miles per tank. I have looked for leaks and havn't found any. I am a "spirited driver" but 110 miles per tank seems abit ridiculous. Any ideas on what could be causing this dip in gas mileage?

-THX!

[Lanc3r]

Hey I have a 1991 318is w/ 183k, and I have always used 93 oct. Lately, I have noticed I average around 110 miles per tank. I have looked for leaks and havn't found any. I am a "spirited driver" but 110 miles per tank seems abit ridiculous. Any ideas on what could be causing this dip in gas mileage?

-THX!


When was the last time you changed your O2 sensor?

Tire pressure? Tires?

Brakes?

All of the above can affect MPG.

[e30]

When was the last time you changed your O2 sensor?

Tire pressure? Tires?

Brakes?

All of the above can affect MPG.

I havn't changed the O2 since I bought the car in 2002, I have ruffly put 45k on it since then, how often do they need changed?

[e30]

update: ok driving today between my dads house and my house (which is 30 miles) I realised my odometer showed only 11! Thats 2/3 less than actual miles! I'm releaved to figure this out, because I was starting to think gremlins where siphoning gas from tank! :dunno:

[9x16]

I think o2 sensors need to be changed every 25K.Im not sure what bmw recommends.