My MPG Is A JOKE Right Now!
01-10-2010, 04:15 PM
#1
Registered
Thread Starter
Join Date: Dec 2008
Location: Orange County, California
Posts: 895
Likes: 0
Received 0 Likes
on
0 Posts
My MPG Is A JOKE Right Now!
So, when I first got my 2004 BB MT with 57k miles my gas mileage wasn't terrible. Probably around 14-18 MPG, which is somewhat average. But over the three months I've owned this thing it's gotten gradually worse and worse. Last night when I filled up I calculated 11 MPG. I don't drive the car very hard that often, not enough to get that low of MPG. So I know there's a few things that could be causing this. The first thing I was gonna do is buy new Spark Plugs considering I have no idea when the previous owner got new ones. Anyone else have any suggestions?
Note: This is my second RX8, so I know the gas mileage to expect, don't treat me like a n00b
Note: This is my second RX8, so I know the gas mileage to expect, don't treat me like a n00b
01-10-2010, 04:22 PM
#2
Do the usual maintenance and check-ups:
Ignition (spark plugs, wires, coils, whatever)
Catalyzer
How long does 1kg of added oil last?
Recent modifications?
Maf\IAT conditions?
Ignition (spark plugs, wires, coils, whatever)
Catalyzer
How long does 1kg of added oil last?
Recent modifications?
Maf\IAT conditions?
01-10-2010, 05:15 PM
#4
Administrator
iTrader: (7)
zach: listen to Brettus and Bse, odds are your problem lies in there somewhere.
Is the car stock? (aside from visual mods) OEM intake?
routine maintenance is critical for our cars.
if you have a multimeter you could check the coils.
Is the car stock? (aside from visual mods) OEM intake?
routine maintenance is critical for our cars.
if you have a multimeter you could check the coils.
01-10-2010, 05:17 PM
#5
Registered
iTrader: (2)
Join Date: Oct 2007
Location: Pacific Northwest
Posts: 16,684
Likes: 0
Received 240 Likes
on
110 Posts
Zach, my MPG is usually 18-22, but when my cat fried up, it dropped my MPG to ~9. If the coils, plugs, wires, MAF sensor cleaning, new air filter, and e-shaft sensor reset don't fix it, get the car in to a dealer to look at the cat.
01-10-2010, 06:56 PM
#6
Registered
Thread Starter
Join Date: Dec 2008
Location: Orange County, California
Posts: 895
Likes: 0
Received 0 Likes
on
0 Posts
I'm installing a supercat next week, so we'll see what that does. I have a K&N drop in filter, but my oil light has been occasionally coming on, so i'm going to add some oil now.
01-10-2010, 07:13 PM
#9
replace your coils, wires and plugs. i did mine yesterday and my mileage has shot right up,113 km and not even a quater tank used. idles very smoothly and pulls alot harder.i wish i had done this when i bought her a year and half ago and really for a few hundred bucks you cant go wrong.
01-10-2010, 08:35 PM
#17
Rotary wanabee
iTrader: (1)
Join Date: Jul 2007
Location: Long Island, NY
Posts: 1,978
Likes: 0
Received 0 Likes
on
0 Posts
motor flush is poured into the oil and ran for 10 min .. then when you drain the oil ... a lot more crap comes out.. it has cleaners in it ... most importantly it lowers the viscosity of the oil so it all comes out very quickly
01-10-2010, 09:07 PM
#18
Registered
Join Date: Jul 2004
Location: Northern California
Posts: 2,196
Likes: 0
Received 0 Likes
on
0 Posts
The problem with that is there are still three quarts in you oil coolers with that Flush running for thousands of miles before your next oil change. I would change it sooner.
01-16-2010, 05:08 PM
#19
Registered
Join Date: Sep 2008
Location: Pacific Beach, San Diego, Ca
Posts: 166
Likes: 0
Received 1 Like
on
1 Post
I get close to 20 during highway driving 70-80mph.
But If I do city driving for the whole tank, its really sad - like 11.
My car hates city driving. I've seen fuel needle move just while warming up sometimes.
But If I do city driving for the whole tank, its really sad - like 11.
My car hates city driving. I've seen fuel needle move just while warming up sometimes.
