bum gas mileage? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Engine Performance This section is for discussion on all engine building related questions.
Sponsored by:
Sponsored by:

Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 12-11-2011, 04:04 AM   #21
Junior Member
 
Join Date: Dec 2009
Location: ON, Canada
Posts: 106
Total Cats: 2
Default

25mpg's from an 18 year old car.....that sucks. Come on what are you expecting....the difference between you and your friend would be driving habits. Enjoy the driving experience and forget about the mpg. I never understand these threads: a convertible does not yield the best fuel economy...especially one that has early 90"s tech.
Staffah is offline   Reply With Quote
Old 12-11-2011, 11:06 AM   #22
Junior Member
Thread Starter
 
Join Date: Sep 2011
Location: Columbia, SC
Posts: 71
Total Cats: 0
Default

I dont think driving habits are the reason since he likes to bounce it off of the rev limiter...alot. Also the engine isnt 18 years old its only 8
jhink92 is offline   Reply With Quote
Old 12-11-2011, 12:14 PM   #23
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

delete, evidently I has no spelink skill.
Godless Commie is offline   Reply With Quote
Old 12-11-2011, 12:15 PM   #24
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

Quote:
Originally Posted by jhink92 View Post
Also the engine isnt 18 years old its only 8
especially one that has early 90"s tech.

The engine could have been rebuilt yesterday. It's the technology that's about a couple of decades old.
Godless Commie is offline   Reply With Quote
Old 12-11-2011, 02:46 PM   #25
Elite Member
iTrader: (1)
 
Join Date: Dec 2010
Location: SoCal
Posts: 4,165
Total Cats: 19
Default

Yes, but if it got 30 on the highway new, gets rebuilt and gets less then 30, then what gives?
gearhead_318 is offline   Reply With Quote
Old 12-11-2011, 03:31 PM   #26
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

Depends on what's rebuilt, I guess. You can have all shiny metal, with a bunch of old sensors and wiring.
MAF, O2, TPS, CTS, etc, all play a major role on MPG.

Also, there are things like injector pintles, cat clogging, incorrect wheel alignment geometry, and stuff, too.
Godless Commie is offline   Reply With Quote
Old 12-11-2011, 03:43 PM   #27
Junior Member
Thread Starter
 
Join Date: Sep 2011
Location: Columbia, SC
Posts: 71
Total Cats: 0
Default

Godless commie: see whether you realized it or not you had just answered my question
jhink92 is offline   Reply With Quote
Old 12-11-2011, 03:45 PM   #28
Junior Member
Thread Starter
 
Join Date: Sep 2011
Location: Columbia, SC
Posts: 71
Total Cats: 0
Default

also the cats like two years old
jhink92 is offline   Reply With Quote
Old 12-11-2011, 03:45 PM   #29
Elite Member
iTrader: (2)
 
Join Date: Jun 2009
Location: Istanbul, Turkey
Posts: 2,050
Total Cats: 433
Default

Thank you..
Godless Commie is offline   Reply With Quote
Old 02-06-2012, 12:57 AM   #30
Elite Member
iTrader: (1)
 
Join Date: Dec 2010
Location: SoCal
Posts: 4,165
Total Cats: 19
Default

Until a month or two ago I got a pretty regular 25mpg per tank of gas, but now I'm around like 20 on a regular basis (several tanks), got an oil change, it didn't help at all. I've heard that the "winter blend" of gas can yield poorer mileage, but would it be that big of a change? I've tried running on regular and mid grade, no change. Also it seems like my exhaust tip has more soot on it then before. There is no check engine light on.

I'm going to start replacing o2 sensors and since my car is a '97 it has two, one on the exhaust manifold and one after the cat. I've read that if one of them has gone bad and is causing the car to get worse mileage, then it is probably the one on the manifold, any truth to this? Any other ideas to help with mileage besides driving style? Btw, driving style stayed the same before and after the mpg drop.
The engine is stock.

Thanks.
gearhead_318 is offline   Reply With Quote
Old 02-06-2012, 04:03 AM   #31
Newb
 
Join Date: Jan 2012
Location: Downey CA
Posts: 20
Total Cats: 0
Default

My old 1.6 got 25 city and 30-32 highway.
TerranWELDER is offline   Reply With Quote
Old 02-06-2012, 06:02 AM   #32
Senior Member
iTrader: (1)
 
Join Date: Apr 2010
Location: Portales, NM
Posts: 837
Total Cats: 2
Default

I get 20 tops at 70 on freeway :(
jbrown7815 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
MP62 maintenance Pist0n Supercharger Discussion 3 10-10-2015 05:23 PM
Someone help me with AE ihiryu MEGAsquirt 33 10-08-2015 05:56 PM
Noob to Miataturbo from MA JxPhan Meet and Greet 3 10-02-2015 03:17 AM
New M62 Miata owner Pist0n Meet and Greet 4 10-01-2015 09:18 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:41 AM.