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Coupes & Convertibles Mazda RX-8 Mazda RX-8 Gas Mileage Reports
91 messages, Last post on Feb 13, 2009 at 9:37 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. |
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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!
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Replying to: rx8wannab (Dec 14, 2006 11:14 am) If you think "upgrades" should address fuel efficiency, time to buy a Prius. 
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Replying to: pathstar1 (Dec 14, 2006 12:22 pm) 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.
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Replying to: rx8wannab (Dec 18, 2006 9:52 am) 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.
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Replying to: trispec (Jan 02, 2007 2:43 pm) 
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Replying to: rx8wannab (Jan 17, 2007 2:26 pm) |
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Replying to: mba2dna (Aug 05, 2005 8:16 pm)
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Replying to: rx8wannab (Dec 14, 2006 11:14 am) If I took $30 from your wallet every month, I would be put in jail. Called stealing... Can you say "Class Action Law Suite". If you are thinking about buying a Mazda RX8... DON'T!
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Replying to: dprfd (Apr 19, 2007 5:34 am) Yes, I don't like it, but yes I was expecting it. My car is also an 05 with 6mt and probably had updated firmware when I picked it up - I had asked the dealer to be sure that was up to date, pre-delivery. The cat converter recall had no affect positive or negative with the mileage. Folks here and on the various 8 message boards report better mileage than I get. If they also have 6mt cars, then I assume the are just putting around in them. I drive mine as it was designed - like a sports car - and I am sure the mileage suffers. If I want to putt around, I can take the xB and drive it hard and still get 27mph, or the S2000 can be driven to the redline and do no worse the 23mph. I got a sports car that got bad mileage, but knew that going in. So while I complain about it, it IS my fault  Dennis
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