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E36/7 Z3 (1996-2002)
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  #1  
Old 08-04-2019, 08:23 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
checkimg mpg

I have checked my mpg .I am getting about 16 mpg .car runs great but mpg is low .found 3 vac leakes and have changed the plugs.the plugs looked light tan with a ash deposit on them.after the plug change it ran good with a SOP of power gain.to gain back more mpg what else should I look at?
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  #2  
Old 08-05-2019, 11:58 AM
zed3coupe zed3coupe is offline
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Location: CO
 
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Mein Auto: 1999 BMW M Coupe
What engine? Driving style?
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1999 M Coupe.
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  #3  
Old 08-05-2019, 03:49 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
2.5 Trying to drive the speed limit but you will get ran over if you don't go 75 to 80 on the high way .The car gained a lot of hp with the vac leaks repaired and new spark plugs.the mpg seems low .wanting to make sure that there nothing else wrong.
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  #4  
Old 08-06-2019, 06:45 AM
RogerEH RogerEH is offline
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Location: Pennsylvania, USA
 
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Mein Auto: 1999 Z3
I'm only getting 16-17 mpg on my 1999 Z3 roadster. Worse part is it takes hi-test gas at close to $5/gal. Choice of 89 octane which is two lower than 91, or 93 octane which is two higher. I haven't tried the 89 so I'm running the 93.
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1999 BMW Z3
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  #5  
Old 08-06-2019, 07:28 AM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
i am using 91 octane . after these repair I am hoping for better mpg.everytning that I have read I should be getting 18 -21 average.will try another tank of gas and see what I get.
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  #6  
Old 08-06-2019, 08:25 AM
RogerEH RogerEH is offline
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Location: Pennsylvania, USA
 
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Mein Auto: 1999 Z3
91 octane not available here. Just 87, 89, and 93.
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1999 BMW Z3
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  #7  
Old 08-06-2019, 09:21 AM
southcoastguy southcoastguy is offline
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Location: Mattapoisett, MA
 
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Mein Auto: 328xi
Nearly $5 a gallon? Where are you in Penna?
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  #8  
Old 08-06-2019, 09:28 AM
RogerEH RogerEH is offline
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Location: Pennsylvania, USA
 
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Mein Auto: 1999 Z3
yes, southern PA. Home of the highest gas tax in the USA.
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1999 BMW Z3
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  #9  
Old 08-06-2019, 11:18 AM
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vintage42 vintage42 is offline
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Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,755
Mein Auto: 1997 BMW Z3 1.9 5MT
Continuing to veer from topic, but...
CostCo Top Tier 93 is $2.98 In Louisville today. And here's my three fill ups this year:
Date - Trip Meter - Gallons - MPG - Driving Type
3-Jan-19 - 49,544 - 183 - 6.6 = 27.8 in city, suburb
3-Jun-19 - 49,758 - 215 - 7.7 = 27.8 in city, suburb
19-Jul-19 - 49,989 - 230 - 8.0 = 28.8 in city, suburb, 1/2 rural

Last edited by vintage42; 08-06-2019 at 04:47 PM.
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  #10  
Old 08-06-2019, 03:50 PM
zed3coupe zed3coupe is offline
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Location: CO
 
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Mein Auto: 1999 BMW M Coupe
I get around 17mpg in my M Coupe around town but a lot of high rev driving. When I had my Z3 Coupe 3.0 I was around 22-24 mpg around town. The S52 isn't as efficient I guess lol.
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  #11  
Old 08-06-2019, 04:09 PM
zed3roadster zed3roadster is online now
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Location: Belleville, Ontario
 
Join Date: Sep 2015
Posts: 63
Mein Auto: 1997 Montreal Blue Z3 2.8
I got 29.1 mpg with my 1997 Z3 2.8 on our 2100 mile plus round trip to ZFEST this year in Blacksburg, Virginia which involved back roads, interstates and some city driving (more interstate driving than I would have liked). There was a fair bit of spirited driving during ZFEST. Last summer on a 2600 mile plus trip to the east coast and back, I got 29.4 mpg.


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  #12  
Old 08-06-2019, 05:04 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
Quote:
Originally Posted by vintage42 View Post
Continuing to veer from topic, but...
CostCo Top Tier 93 is $2.98 In Louisville today. And here's my three fill ups this year:
Date - Trip Meter - Gallons - MPG - Driving Type
3-Jan-19 - 49,544 - 183 - 6.6 = 27.8 in city, suburb
3-Jun-19 - 49,758 - 215 - 7.7 = 27.8 in city, suburb
19-Jul-19 - 49,989 - 230 - 8.0 = 28.8 in city, suburb, 1/2 rural
that's great mpg. I am wondering what else is wrong on my car that I should be looking at.the car runs great but the mpg is not were it should be.i am hoping the Costco gas will be a improvement over what the other owner was using.
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  #13  
Old 08-07-2019, 05:52 AM
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vintage42 vintage42 is offline
BMW CCA 1405
Location: Louisville, KY
 
Join Date: Jun 2007
Posts: 4,755
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by [email protected] View Post
... car runs great but the mpg is not were it should be.i am hoping the Costco gas will be a improvement over what the other owner was using.
Costco gas will not affect the running or the mileage. But it is probably the least expensive Top Tier gas.
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  #14  
Old 08-07-2019, 08:27 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
hoping that by using top tier gas only that I will not get a ash deposit on the plugs.I don't know what the guy before me used .New plugs and a full tank of Costco gas gave the car a lot more pep.the old plugs had a yellowish ash deposits on them.i also fixed three vac leaks.Air filter looks good .what else can I look at that is causing low mpg?
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  #15  
Old 08-07-2019, 11:42 PM
Ersanto Ersanto is offline
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Location: NorCal
 
Join Date: Aug 2017
Posts: 5
Mein Auto: 325i (E46) + Z3 2.3
I have a 1999 2.3 and get about 18.5 driving mostly short distances, on the hills. 91 gas only, which is the higher octane available here.
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  #16  
Old 08-08-2019, 09:52 AM
RogerEH RogerEH is offline
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Location: Pennsylvania, USA
 
Join Date: Apr 2018
Posts: 97
Mein Auto: 1999 Z3
I need to amend my gas price quote. I filled up today and it was a little over $3 for 93 octane. I got an even 20.0 MPG driving on back country roads. The $5 was a memory mistake
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1999 BMW Z3
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  #17  
Old 08-08-2019, 12:52 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
just filled up today. after the repairs ,I am now getting 23 mpg .that I can live with.
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  #18  
Old 08-14-2019, 02:02 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
okay I am now on my forth tank a fuel .I got 26.5 mpg.i think the motor is now running like it should. .
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  #19  
Old 08-14-2019, 06:51 PM
ZEEBOY ZEEBOY is offline
The Arkleyologist
Location: SW Ohio
 
Join Date: Nov 2006
Posts: 532
Mein Auto: 1997 Z3 Roadster 2.8
I have owned four z3's..have always averaged 24/25 mpg in overall driving...29 mpg on highway trips..
(Six cylinder motor)
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  #20  
Old 08-14-2019, 08:13 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 41
Mein Auto: 2001 z3
wow you have owned 4 z3.You have enjoyed a great car.tell us which car and options you liked the best.I wish I would have bought my car years ago.
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  #21  
Old 08-15-2019, 05:25 AM
rudyrov rudyrov is offline
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Location: Bothell, WA.
 
Join Date: Sep 2011
Posts: 194
Mein Auto: 1998 BMW Z3
My 98 Z3 has a 2.8L and 5 speed and I get roughly 20 to 21 as long as I dont get crazy with the pedal.
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