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Old 06-14-2008, 02:21 PM   #1
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Default 23mpg

this last tank was 23mpg 218.8 miles and 9.493 gallons, consisted of 1/3 my 3 mile commute to work stop and go, 1/3 weeked cruising, and 1/3 tuning and boosting the **** out it. overall i'm pretty happy with that considering stock was rated 21city 27 highway on my 93.

But i'm wondering if i can do better. is anyone beating that without highway driving? if so what are you're afr's tuned at idle, normal driving, and cruise? or any other tips to improve any in ms?
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Old 06-14-2008, 10:32 PM   #2
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on my old turbo probe, i was getting 35+ mpg highway with megasquirt at a 14.7 afr
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Old 06-14-2008, 11:24 PM   #3
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Boy, I wish I could average 23 mpg!

On the highway with the top up, I get just about 30 MPG. Despite being small and lightweight, the Miata is not very aerodynamically efficient.

In town, 19-20 is more typical. Of course, I'm not terribly gentle on the throttle.
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Old 06-15-2008, 12:03 AM   #4
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man ive been babying my car around lately ... hardly even hit boost anymore with gas prices. Anyway ive tried to tune pretty much anything under 70kpa to around 16:1ish and have aggressive EGO correction up to that point to keep it running lean (15% max change, 32cycles, stepsize 1, 1500rpm)

Anyway, ive gotten like 20mpg in the past but recently went more lean with my fueling and i think its going to get a few points higher this time.
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Old 06-15-2008, 02:39 AM   #5
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Around town, I do about 18 or so. If I stick to 70-75mph, I can do around 27mpg. If I cruise at 80+, I end up at 24-25mpg.
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Old 06-15-2008, 01:37 PM   #6
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do you have a 4.1 final gear? did you factor in this loss?

I have to add 10% to my tripometer to get my correct mpg. with that said I achieved 22.5mpg city only.
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Old 06-15-2008, 01:43 PM   #7
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Since I've switched to COP's and bumped up to the "hybrid" spark map, the lowest tank I've had is 24mpg... and that included a lot of boosted tune runs. I'm pretty sure on the freeway at 70mph w/about 15-18vaccum, I get about 30mpg. But I also see 14psi at every stoplight, every onramp, and every Honda.
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Old 06-15-2008, 01:49 PM   #8
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I'm usually around 26 mpg, I drive like most of you, cruise like normal, but see 14 psi when I'm feeling saucy.
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Old 06-15-2008, 05:46 PM   #9
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Grape vine to 152 on hwy5 (CA, reasonably flat running for ~200 miles or so) with the CC set at 75 and AC on I was getting about 23mpq (a couple of minor deviations, when a BMW started tailgating for some reason and needed to be ditched, twice; but it was mostly just on cruise control).
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Old 06-17-2008, 09:28 AM   #10
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I get 26 on an average tank, but over 35mpg on the motorway and I run 11psi of boost.
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Old 06-17-2008, 04:42 PM   #11
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ive always noticed that people in california get worse mileage than the rest of the nation, couple of points or so.
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Old 06-17-2008, 04:47 PM   #12
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I wonder...Did the Miata have a CA and a US version? I know a lot of newer cars have slightly different parts(mostly smog related) depending on whether or not htey were desined to be CA cars which might explain some slight MPG differences
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Old 06-17-2008, 04:58 PM   #13
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I average 29mpg, but I drive sloooow....
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Old 06-17-2008, 05:34 PM   #14
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Quote:
Originally Posted by Jefe View Post
I average 29mpg, but I drive sloooow....
Same here...I get about 27 city. I never drive on the highway since it's summer and im a lazy ***.
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Old 06-18-2008, 03:46 AM   #15
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normal me driving i pull bout 25 me driving fast i pull bout 16, how and where you drive is important. Hardtop helps me to. Ive had 30-33 pre ms on rrfpr etc. no word on top of ms though.
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Old 06-18-2008, 12:24 PM   #16
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Quote:
Originally Posted by J.T. View Post
I wonder...Did the Miata have a CA and a US version? I know a lot of newer cars have slightly different parts(mostly smog related) depending on whether or not htey were desined to be CA cars which might explain some slight MPG differences
For some years yes, for some years no. For example, '90-'92 were 50 state cars, but in '93 the CA car for sequential injection which the 49 state car didn't get until the 1.8 engine a year later.

It's fairly irrelevant however, as we tend to remove all the bits that differentiate the cars when we go MS.

I suspect that the difference has to do with our fuel having a lower energy density.
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Old 06-18-2008, 12:44 PM   #17
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I got 25 last tank, due to the top being down and nearly all city driving. With the soft top up, I'll get nearly 30 and over 30 with the hard top. This includes WOT from 1st to 4th as often as possible, as well as plenty of pulls from 4 to 6-6.5k in 5th--Just so I can hear it go "PSHHHHEWWW".

19.2:1 FTMFW
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Old 06-18-2008, 01:03 PM   #18
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Quote:
Originally Posted by Mach929 View Post
this last tank was 23mpg 218.8 miles and 9.493 gallons, consisted of 1/3 my 3 mile commute to work stop and go, 1/3 weeked cruising, and 1/3 tuning and boosting the **** out it. overall i'm pretty happy with that considering stock was rated 21city 27 highway on my 93.

But i'm wondering if i can do better. is anyone beating that without highway driving? if so what are you're afr's tuned at idle, normal driving, and cruise? or any other tips to improve any in ms?
What injectors are you using?
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Old 06-18-2008, 01:27 PM   #19
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I can't seem to get better than 24mpg on my stock 1.6.
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Old 06-18-2008, 01:41 PM   #20
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Quote:
Originally Posted by Rafa View Post
What injectors are you using?
i'm using rx7 550cc pnp inejectors that flowed out at 620cc
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