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E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

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  #26  
Old 09-07-2019, 11:27 AM
Barbarella Barbarella is offline
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Mein Auto:
This is a little late, but I noticed that responses came from members living at differing elevations. I found a couple discussions on other sites about how elevation is a determinant in mpg and in choosing the proper octane. Apparently, fuel injection engines don't change this, do prevent stalling.
I have been using 88 octane gas in my 2001 z3, which in New Mexico is an intermediate grade gas. Because I live at ~6000 ft, this is plenty high octane level. I get about 20 mpg in town and 24 mpg highway with my 6 cylinder, manual 5 speed z3. I have had no issues with the engine, but I'm now wondering whether the NM standard 86 would be still okay and give me better gas mileage. If he interested in other's comments on the octane/elevation/mpg issue.

https://www.quora.com/Why-New-Mexico...uying-this-gas

https://itstillruns.com/effect-eleva...e-6744997.html
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  #27  
Old 09-07-2019, 03:07 PM
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vintage42 vintage42 is offline
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Location: Louisville, KY
 
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Posts: 4,810
Mein Auto: 1997 BMW Z3 1.9 5MT
Quote:
Originally Posted by Barbarella View Post
... using 88 octane gas in my 2001 z3... Because I live at ~6000 ft... I have had no issues with the engine, but I'm now wondering whether the NM standard 86 would be still okay and give me better gas mileage...
You will have no issues with the engine on the lowest available octane. The knock sensor will protect it by reducing the timing advance under load or high rpm. The lesser efficiency under those intermittent conditions will reduce MPG, but that cost might be offset by the less expensive gas.
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  #28  
Old 09-07-2019, 04:15 PM
Autoputzer Autoputzer is offline
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Location: NW Floriduh
 
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Mein Auto: 2014 535i + 2018 X3 30i
Quote:
Originally Posted by RogerEH View Post
91 octane not available here. Just 87, 89, and 93.
You can make your own 91 AKI by getting 2/3's 93 AKI and 1/3 87 AKI. If you reset your MPG and trip odometer at fill-up, you can accurately estimate how much gas you will need at the next fill up. Doing this saves me about $3.50 per tank and about $800 over the 100k miles I keep a car.

Last edited by Autoputzer; 09-07-2019 at 04:42 PM.
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  #29  
Old 09-09-2019, 05:44 AM
mwhayden mwhayden is offline
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Location: Illinois
 
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Posts: 52
Mein Auto: Z3
We in Illinois just received a whopping 15 cents a gallon increase!!!!
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  #30  
Old 09-09-2019, 08:49 PM
[email protected] tgilbert@embarq is offline
terry2001z3
Location: columbia city IN
 
Join Date: Jul 2019
Posts: 71
Mein Auto: 2001 z3
that's a big increase .is that all tax or just the oil company rip off
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  #31  
Old 09-10-2019, 06:44 AM
rudyrov rudyrov is offline
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Location: Bothell, WA.
 
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Mein Auto: 1998 BMW Z3
I have been using "Regular" grade fuel in my 2.8L Z3 Roadster since I bought the car, and it runs very well. I occasionally run a "Super" grade when I am going to pus the car hard, like at a rally or a track day.
I have had no issues and do get 20 on the street and 24 or so on the freeway / highway.
I do think the best thing is to use a good reliable supplier for fuel to avoid contaminants so I pretty much use Costco as my gas station and I get the lowest prices in town.
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  #32  
Old 09-10-2019, 06:58 AM
Autoputzer Autoputzer is offline
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Location: NW Floriduh
 
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Mein Auto: 2014 535i + 2018 X3 30i
My last tank of blended 91 AKI was $2.94/gallon, and Florida gas is more expensive than Alabama, Tennessee, or South Carolina gas. My gas strategery for road trips it to enter Alabama close to empty. The tank of fuel I buy there gets me to Tennessee or South Carolina. If I'm going up I-95, I can get from Bubbaville, Floriduh up into South Carolina on one tank in my 535i. My longest range in that car has been 520 miles. In my old E46 M3, 325 mile was pushing it.
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