Yaris MPG Drop

[xdarkxfirex]

Anyone notice this. Yaris is about 9 years old, I replaced the original plugs on them about three years ago with NGK BKR5EIX11 Iridium IX with ones I got on sale from canadian tire. Since then, I have put around 70k on them. Pulled them out and they dont really look worn. Cleaned them off and reused them. Air filter is clean, and throttle body I cleaned probably 20-30k ago.

I also do the occasional fuel injector cleaner which I doubt has much effect anyways.

[ex-x-fire]

Dirty maf or engine running cooler (bad t stat).

[dogsridewith]

Colder weather drops tire pressure (gas law) and stiffens tire rubber. Also thickens lubricants and delays warm-up.

[Kaotic Lazagna]

Your local gas stations may have also switched to a cold temp/season/winter blend, which always causes a drop in mpg. Check you tire pressure as well.

[Bluevitz-rs]

Yeah, mine has dropped too. My bet is on winter gas already.