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I now have about 2100 miles on the RX8, and followed break-in procedures pretty closely (in spirit at least). My mileage has been as low as 13.9, and as high as 16.0. My driving is around the suburbs and some medium sized streets, not too much highway - no more than 10% or so. My driving style is fairly spirited, and I do wind the car up. This last weekend I drove from Cincinnati to Cleveland and back. The tank on the way up (80% highway) got me 18MPG! This was averaging 75MPH, with a few miles at > 100MPH. On the way back I strictly obeyed the speed limit, and got 23.5MPG! Ambient temperature was 35-45 degrees, with a cross wind.
Consequently I am much happier about my mileage. At least there doesn't appear to be anything grossly wrong with the engine. Hopefully canzoomer's efforts will help in this area too.
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Velocity Red, GT, Auto, Nav, Rotary Accents, Exhaust Finishers, Al pedals, Al doorsills, Strakes, Foot lighting, Rotary valve caps
Glad to hear the mileage improves. I am on my 3rd tank and getting around 14.5 mi/gal in the city. Had I not been reading this forum for the past month I would have been seriously pestering my Mazda service manager. With this vehicle weighing only 3K lbs and assuming a clean burn with low emissions it does make one wonder where all the energy goes. CanZoomer's ECU mod will definitely be in my future.
Thanks to all the fine folks on this forum I knew about the horsepower / mileage issues long before purchasing so I am most definitely not complaining.
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10/23/2003 Velocity Red RX-8, Red/Blk Leather, 6-MT, 6-CD, Grand Touring, chrome rims, NAV, strakes, exhaust finishers, rotary accents, spoiler, air dam, splash guards, XM Commander, Nokia Handsfree
On order: Lighted shift knob
Location: Maysville, Colorado -- Beyond here be dragons!
Posts: 35
Has anyone yet "tickled-out" the parameters for optimum fuel efficiency on these things? I know that in my decrepit Miata I can get as much as 39.9 (!) MPG by running a hair short of full throttle up to a bit less than 4,000 RPM. At WOT or over 4,000 it runs open-loop and mileage goes to hell (30 or less -- sorry).
I'm sure that there's a lot more to it on a befuddlingly complex 8.
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"Don't confuse symmetry with balance" Tom Robbins
Originally posted by Rx-Appreci-8 Glad to hear the mileage improves. I am on my 3rd tank and getting around 14.5 mi/gal in the city. Had I not been reading this forum for the past month I would have been seriously pestering my Mazda service manager. With this vehicle weighing only 3K lbs and assuming a clean burn with low emissions it does make one wonder where all the energy goes. CanZoomer's ECU mod will definitely be in my future.
Thanks to all the fine folks on this forum I knew about the horsepower / mileage issues long before purchasing so I am most definitely not complaining.
It seems like the car is really sensitive to idling at stop lights. City driving really appears to kill it! I don't really care, so long as I pass emissions testing and get semi-decent long distance cruising. I don't drive highway much. It's actually just as well, because I cannot drive this car too slowly. It's really torture running at 58MPH.
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Velocity Red, GT, Auto, Nav, Rotary Accents, Exhaust Finishers, Al pedals, Al doorsills, Strakes, Foot lighting, Rotary valve caps
Originally posted by VelocityRedRX8 It seems like the car is really sensitive to idling at stop lights. City driving really appears to kill it! I don't really care, so long as I pass emissions testing and get semi-decent long distance cruising. I don't drive highway much. It's actually just as well, because I cannot drive this car too slowly. It's really torture running at 58MPH.
it gets real thirsty at startup and idle.
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I am the President of the Lounge.
2006 Mustang GT Torch red, 5 speed MT
SHR Aluminum Billet Fuel Door
K&N CAI
Shorty Antenna
Originally posted by Rx-Appreci-8 With this vehicle weighing only 3K lbs and assuming a clean burn with low emissions it does make one wonder where all the energy goes
Heat!
I'm encouraged that someone has got 23.5 mpg, even if it was at a constant 55 mph. At least it proves that it is theoretically possible to get into the high twenties (UK mpg) although I can't see myself doing it very often.
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RX-8 High Power
Velocity Red, Black Leather
I have been getting 16 MPG since I got my car but this week I hit 19 MPG due to mostly highway driving.
I usually fill up when the warning light comes on but tried going further yesterday. The needle soon went below E whcih got me concerned, I exited the freeway to fill up and there was 2.2 gallons left (full tank is 15.9 and it took 13.7 gal.).
I figure you have around 2.5-3.0 gallons left when the light comes on.
Happier about mileage
Linear Mode
