Tremendous drop in fuel consumption

[rcalma]

this is my first post, and i'm glad that i found this forum.

this summer I used to get 500- 520km from every full tank (50-53 liters usually) but to my surprise my last two full tanks I only gets 425(51L) and 431(52L) With same route, gas station and driving style.

The recent maintenance done:

Change plugs (same on the old ones)
Change oil and filter (same brand)
Change air filter with simota cone filter.

I’m wondering what went wrong to loss more or less 80km in one full tank.
There is no CEL , no dragging brakes, tire air pressure are within specs.
Yesterday I put the stock air intake back, guessing this is the cause, but is the warmer air vs colder air will affect that much in fuel consumption?

Would love to hear your thoughts and expertise

Thank you

 

[xci.ed6]

It could, again I'd use 'torque' to check readings.

O2 sensor voltage, injector time, etc...

 

[rcalma]

I've returned the stock air duct and the old plugs, after a tank (50/50 city/hway) I recorded 485km for 51L, this is what she usually gets in my everyday driving.
Another full tank with 90% hway just yesterday she got 320km half tank.
Is this number right for my accord?

 

[spacemonkee23]

**Tremendous Increase in fuel consumption**

 

[sb001]

**Tremendous Increase in fuel consumption**

That's what I was thinking too

 

[DizzyP]

My milage dropped too. I worked on a few things to help it out. The guys at the shop said my brakes are glazed blue like I ride them a lot. I can do some spirited driving but that doesn't involve the brake so much do I check the rear brakes to see if they are dragging and this weekend will check the fronts. So you can consider that. It's an easy check.


iPhone using Tapatalk, sent from my.

 

[xci.ed6]

Also, could have had a plug problem. Old & worn, or speshule?

 

[DizzyP]

I already changed plugs and minimal gains. I made sure they all spark too.


iPhone using Tapatalk, sent from my.

 

[spacemonkee23]

17mpg for me all city... V6 205k original engine and trans.

 

[xci.ed6]

I like to see 20, but usually I hit 18ish.

Stopped wearing out the VTEC