2004 to 2016 Mazda 3 Forum and Mazdaspeed 3 Forums banner

1 - 6 of 6 Posts

·
Registered
Joined
·
82 Posts
Discussion Starter #1
Hello all and that you for any help,
My mpg has deteriorated to a point it shows 4 mpg at very low and city speeds feathering the throttle.
at highway it is at 33.
when I got the car it was nothing like this.. was getting constant 23 at city at 35 at highway.
my car in a 2.0 165bhp.
Any info on what could cause this ? maybe a vacuum hose ? where are the vacuum hoses located in our engine ?
No check engine light.
I did once ran the engine with airbox off for approx 30 seconds by mistake (dont know if this could have messed with something but it was long ago)
the car has done 9500 km on it ~ 6k miles.
Thanks for any info/help
 

·
Working Class Hero
Joined
·
3,566 Posts
Have you actually started using more gas, or are you just going by what the dash display says? If you're driving in stop and go city traffic all the time, the display will show you poor mileage. That's just how it goes. If you're viewing the average and you do a lot if city driving, that average will drop over time. Do yourself a favor and do the math when you fill the tank. Keep one trip odometer for mileage per tank, reset when you fill up. It's really the only reliable way to figure fuel economy long term.

Sent from a Samsung that doesn't explode.
 

·
Registered
Joined
·
82 Posts
Discussion Starter #4
for start take it to the dealer, this is not normal and it should be repaired under warranty
This is after a transmission swap under warranty . (yep, I stupidly failed to mention that in my post.. sorry)
the mpg dropped when the transmission started acting up.
hoped it would get better again and nothing.. over a month with the NEW transmission.
I hate tacking it to the dealer since to be honest, they have shit service locally.
was hoping it should be a vacuum hose..?

Have you actually started using more gas, or are you just going by what the dash display says? If you're driving in stop and go city traffic all the time, the display will show you poor mileage. That's just how it goes. If you're viewing the average and you do a lot if city driving, that average will drop over time. Do yourself a favor and do the math when you fill the tank. Keep one trip odometer for mileage per tank, reset when you fill up. It's really the only reliable way to figure fuel economy long term.

Sent from a Samsung that doesn't explode.

good advice actually, will be doing this.
but why would my dash readings get so messed up.. it wasn't the case sooner.


WOW... actually a turn off from loving this car so much.
2016.. gonna be seeing to much mechanics for my taste.. not to mention the heartbreak from the transmission swap.

My 2002 VW golf I had back in the day was kinder to me than my 3..
boo hoo. yah.
 

·
Gearhead
Joined
·
1,841 Posts
Liking what @GerryB asked, i.e., is it just what your dash readings are, or have you calculated your MPG the ole fashioned way and found it is truly greatly reduced?

For the answer to that question could determine whether the fix it from "A" to "Z".
 
1 - 6 of 6 Posts
Top