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Mazda RX-8 Gas Mileage Reports

91 messages,  Last post on Feb 13, 2009 at 9:37 AM

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What is this discussion about? Mazda RX-8, Fuel Efficiency (MPG)


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#59 of 91
Re: Long trip on the 8, still bad mileage [trispec] by dwynne
Sep 25, 2006 (7:28 am)
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Replying to: trispec (Sep 25, 2006 5:31 am)

You are also driving the "de-tuned" auto tranny car . If you had the full 238hp of the 6 speed cars then maybe you would get numbers similar to what my 6 speed returns
 
You must be short and have short passengers too. I love my 8 (except for the mileage, recalls, and lack of resale value) but my 6'+ sons really have trouble fitting in the car with me - and pretty much no one can ride behind me (and I am not that tall). But driving solo it is fine - and close to the thrill of the S2000. With a VooDoo knob the 6 speed in the 8 actually has shorter throws than the S gearbox - which has a very tight pattern.
 
Lots of cars can do close to a g in a corner, and have more power to pull out of it. My M5 could, for sure I prefer a lighter, more tossible car however - which is why have both the s and the 8. Looking at the prices on the mazdaspeed6 I have been tempted to sell the 8 and get one (Mazda has a knack for making great cars that they can't sell) - but it is a good bit heavier than the 8 so ultimately would be less fun for me to drive. Ditto the new G35 - more passenger room, more ponies, better gas mileage, fewer (likely) recalls - but may not be as much fun.
 
Enough of that, since this is the MPG forum - I will just state again 14-15mpg around town and 21.45 on a 95% interstate commute is lousy gas mileage for a small car. Good thing premium here is down under $2.50 a gallon
 
Dennis
#60 of 91
Re: Long trip on the 8, still bad mileage [dwynne] by trispec
Sep 25, 2006 (9:07 am)
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Replying to: dwynne (Sep 25, 2006 7:28 am)

Had to give up on clutches. Besides all cars are going to the paddle shifts. Even NASCAR is thinking about going to auto shifting with paddle. Auto-shifters do shift about ten times faster than pro drivers can.
 
Mazda was aiming at a price point, that's why the auto tranny can't go over 7500. An auto-tranny that can handle 9000 RPM starts to get expensive. The Caparo T1, needs a $13,000 paddled shifted 6 speed auto tranny to handle it's 12000 RPM racing V8. Sticks are definitely going the way of the dodo bird, I think.
 
Beside Boston traffic jams pretty much destroyed my shifting knee and angle after 15 years of sticking it.
#61 of 91
Improved my RX-8 AT MPG by 25% by trispec
Oct 04, 2006 (6:48 am)
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Simple really. Changed my commute route to maximize my ability to coast in full automatic mode. Gone from 14MPH to near 18MPH in the city.
 
I had long taken Pathstar's advise about keeping RPMs above the 3000 level via manual mode paddle shifting, because of wanting to guard against carbon build-up.
 
But then I realized that coasting 50% or more of my commute would keep carbon down even better. There just so happens to be a certain odd combination of routes where, although traffic is heavy, coasting is also almost continuous through out.
 
So rather than trying to have fun on less crowded hills and curves where coasting is just not practical, I'm commuting the slow and steady route with a massive traffic flow.
#62 of 91
Anyone else notice an MPG drop after latest PCM upgrade? by rx8wannab
Dec 14, 2006 (11:14 am)
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I took my 2005 AT in last month for the voluntary recall, and among other things they "upgraded" my PCM. Since then I've noticed about a 1 MPG decline in fuel efficiency. My MPG average for the month before the upgrade was 18.6. Since then it has been 17.6, with no change in driving patterns. Some upgrade!
#63 of 91
Re: Anyone else notice an MPG drop after latest PCM upgrade? [rx8wannab] by pathstar1
Dec 14, 2006 (12:22 pm)
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Replying to: rx8wannab (Dec 14, 2006 11:14 am)

The upgrade could have addressed other issues such as engine life. At any rate, with winter here 1 MPG loss is pretty good. It alone often causes 3-5 MPG loss.
 
If you think "upgrades" should address fuel efficiency, time to buy a Prius.
#64 of 91
Re: Anyone else notice an MPG drop after latest PCM upgrade? [pathstar1] by rx8wannab
Dec 18, 2006 (9:52 am)
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Replying to: pathstar1 (Dec 14, 2006 12:22 pm)

Winter? What's that? I live in Malibu!
Seriously, the cause and effect is quite clear in my case. The lower MPG started immediately with the next tank after the upgrade, and the highest MPG since then hasn't matched the lowest MPG for the month before that.
I didn't expect an upgrade to "address" MPG. I knew what I was buying, and it is worth it. I just didn't expect it to degrade MPG.
#65 of 91
Re: Anyone else notice an MPG drop after latest PCM upgrade? [rx8wannab] by trispec
Jan 02, 2007 (2:43 pm)
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Replying to: rx8wannab (Dec 18, 2006 9:52 am)

Good one. Winter in Malibu LOL. I think pathstar is from Canada though LOL.
 
OTOH, my 2005 RX-8 AT seems to be getting slightly better MPG since the lastest PCM flash. Just got back from my annual 2000 mile trip from Boston to the mountains of NC. On one stretch I got 25.2 MPG with lots of 70-90MPH non-cruise driving on new years day.
#66 of 91
Re: Anyone else notice an MPG drop after latest PCM upgrade? [trispec] by rx8wannab
Jan 17, 2007 (2:26 pm)
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Replying to: trispec (Jan 02, 2007 2:43 pm)

Well, I'm glad at least someone is getting good mileage!
#67 of 91
Re: Anyone else notice an MPG drop after latest PCM upgrade? [rx8wannab] by trispec
Jan 18, 2007 (5:50 am)
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Replying to: rx8wannab (Jan 17, 2007 2:26 pm)

Also, just to add, we've just starting getting some colder temps here in Boston, 9 to 15 degrees in the mornings. Last year, I remember getting horrible 12MPG city driving only, but with my last fill up MPG showed 15MPG city driving only. Now I am driving my RX-8 AT kind of easy these days in full auto mode only, but I'm still thinking 10-20% better MPG since the last PCM.
#68 of 91
Re: Second Tank [mba2dna] by mba2dna
Mar 12, 2007 (12:03 am)
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Replying to: mba2dna (Aug 05, 2005 8:16 pm)

Now, my 8 has 15000 miles, it is around 18 mpg for city and 23 mpg for highway.

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