Last post on Jun 03, 2011 at 11:23 AM
You are in the Mazda RX-8
What is this discussion about?
Mazda RX-8, Fuel Efficiency (MPG)
#66 of 96 Re: Anyone else notice an MPG drop after latest PCM upgrade? [trispec]
Jan 17, 2007 (2:26 pm)
Well, I'm glad at least someone is getting good mileage!
#67 of 96 Re: Anyone else notice an MPG drop after latest PCM upgrade? [rx8wannab]
Jan 18, 2007 (5:50 am)
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 96 Re: Second Tank [mba2dna]
Mar 12, 2007 (12:03 am)
Now, my 8 has 15000 miles, it is around 18 mpg for city and 23 mpg for highway.
#69 of 96 Re: Anyone else notice an MPG drop after latest PCM upgrade? [rx8wannab]
Apr 19, 2007 (5:34 am)
Own 2005 Mazda RX8. Emission Recall 4206F installed and immediately realized 3 MPG loss in gas mileage. After returning car to dealer and several "inspections" later Mazda dealer basically says "tough". Too bad for gas mileage but you should realize better power performance. Mazda did not inform me before (or after) that gas mileage would be affected by this recall. The recall tested for issues I did not have. The result was me paying 8 - 10 dollars more every time I filled up. Please all Mazda RX8 owners need to band together and make Mazda do something.
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!
#70 of 96 Re: Anyone else notice an MPG drop after latest PCM upgrade? [dprfd]
Apr 19, 2007 (11:42 am)
Didn't you research the MPG on the 8 before you purchased? I did, and I knew from the EPA numbers and from lots of other current owners that the mileage would hurl. And it does. I get 14-16mpg on my commute VS 23-24mpg in the S2000 and 27mpg in the xB. It get under 20mpg on a long trip (fill up, drive 70 mph, fill up).
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
#71 of 96 Re: Anyone else notice an MPG drop after latest PCM upgrade? [dwynne]
Apr 21, 2007 (4:11 am)
I've got the 2005 RX-8 AT. After the last PCM flash I actually think I'm getting 10% better gas millage, but then again, I think mt RX-8 has always gotten great millage. For example, on all of my long driving trips (2000 miles), I average 80MPH and get 23MPG. On shorter trips where I average 50-60MPH, millage is 25MPG.
Sure city is still 15-16PMG, but here in Boston, pay back comes from roads that are such an incredible snaking jumble of cow paths. If you can stay out of traffic jams, driving in Boston is a nice balancing of G forces in all directions.
#72 of 96 The new federal millage rating system
Jun 01, 2007 (2:11 am)
Just take a look at the new real world federal millage rating system. The most interesting thing is how close the RX-8 comes to competitors. S2000, Z350, G35, and 'Stang are all only one or two MPG better in the city.
#73 of 96 Re: The new federal millage rating system [trispec]
Jun 04, 2007 (8:34 am)
I own both an 05 S2000 and an 05 RX-8 (6 speed).
I just came back from a trip to the mountains in the S, over 30mpg on the highway (all top down) and 26-29 mpg driving around the mountains (all top down). I get 24 mpg commuting to work (mostly all top down).
My RX-8 with the latest recalls and computer flash gets 14-15 mpg commuting (same route as the S gets 24 mpg) and gets 19 mpg on highway trips - though one time I got 20.5 mpg. And highway driving is mostly set the cruise on 74 or 75 and just ride - so not much room to improve the mileage except to drive slower.
So it does not matter if you use the old or new EPA numbers, when driven as intended the 8 suck fuel like a huge v-8 (or worse). So says all the car mag tests and so say the customers who drive (the 6 speed) in a spirited manner.
In a recent C&R head to head with the 2007 Ford Mustang Shelby GT, the 2007 Mazda RX-8, the 2007 Nissan 350Z, and the 2008 Audi TT 2.0T guess which car "won" the test? Even though it "guzzles gas like a private jet" ?
link to story
Note on their 600 mile test the 8 returned the worst mileage at 15mpg - even lower than the 319 hp Shelby.
I love the car, like C&D I think it is a "winner", but when driven as designed the MPG just sucks
#74 of 96 Re: The new federal millage rating system [dwynne]
Jun 04, 2007 (5:49 pm)
Well MPG isn't much of point to push with the RX-8, but my paddle shifter RX-8 AT seems to get better than your 6 speed RX-8 MT. For example, I average 80MPH on my Boston to Portland evening run and fill up to fill up I get 23MPG. I have gotten 25MPG on a steady 60MPG runs to the Cape. My work commute these days is running 18MPG.
I don't do much paddle shifting any more though, so that may help keep the RPM's down well below 2000 most of the time. I do regularly rev past 5000 and oil consumption in the city is a quart/1000miles.
Thanks for that link. I sure love my RX-8. It still turns heads, especially when four 6' adults exit with all the door open.
#75 of 96 rx8 v 350z mpg
Jun 11, 2007 (2:42 am)
Yeah I agree the RX8 is an amazing ride, just too bad the mpg and lack of torque (no faster than a Nissan Sentra Se-R). I drive a 350Z and normally get 28 mpg at hiway speeds (70-85mph) and about 21 in city driving. And the EPA for my 350Z was 19/25, so obviously they under rated the mpg! And it seems the mpg is overly generous for the RX!