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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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#23 of 91 Re: Best mileage - so far [trispec] by trispec Nov 19, 2005 (6:26 pm)
Replying to: trispec (Nov 19, 2005 5:31 am) Did a small trip today, mostly highway. Got 22.3 mpg. Used full auto, no paddles. Had some nice long stretches at 80+ mph going north on I93 Boston to Franklin above Concord, then across on 11a and 11 to 16 and then down I95.   I'm very happy with that.
#24 of 91 comparisons by ukjim Nov 27, 2005 (5:15 pm)
2004, MT with 14,200 M on the clock. Took weekend trip to Palm Springs from LA. One passenger, trunk full but back seats empty.   Outbound: 168.2 miles at average speed of 29.5 MPH (2 hours plus in stop/go 1st gear traffic due to overturned truck on 10 FWY ) 17.84 MPG   Return: 136.7 miles at average speed of 63.5 MPH (steady 75 -83 mph on 60 FWY ) 20.12 MPH
#25 of 91 ooops by ukjim Nov 27, 2005 (5:18 pm)
20.12 MPG
#26 of 91 2004 RX-8 6spd w/ 26275 miles by goodduck Dec 01, 2005 (5:41 am)
I've been keeping track of gas mileage since day one, which is over 2 yrs ago.   miles: 26275.7 gallons: 1398.596 miles/gallon: 18.79 price: $2847.39 price/gallon: $2.036 miles/dollar: 9.23 miles/day: 30.62 octane: mostly 89   The normal mpg range is 17-22. The 3 exceptions were when I took the car to Sebring Racetrack where it average 8-9 mpg. Fun, fun, fun!
#27 of 91 Re: Best mileage - so far [dwynne] by dwynne Dec 01, 2005 (9:30 am)
Replying to: dwynne (Nov 18, 2005 10:19 pm) Filled up yesterday and got my best mileage so far. Around 1,800 miles on the car now (6mt) and got about 16.25 mpg. This is the best I have gotten for just commuting   Well, the next tank is back down to 14.5 mpg for the same commute, so getting over 16 mpg was just a temporary thing   Dennis
#28 of 91 mileage by lr3rx8 Apr 25, 2006 (10:17 am)
2004 RX-8 33500 miles bought new Nov 2005 for a real good price.   Worst mileage 14.8 Georgia mountain autocross Best 22.8 hwy - 74 mph (wife driving) Daily driving 16-17 45 mile round trip commute. Drive easy 17.7 maybe, Drive hard 16.0 - I pick drive hard...   BTW first set of tires lasted 30K now have Dunlops - much quieter, better ride, slightly better mileage.
#29 of 91 Premium vs Regular by stbarton May 01, 2006 (9:24 am)
Would I be harming the RX8 engine if I used regular 87 octane gas? Also would that effect my gas mileage negatively? Replies to this message: trispec (May 01, 2006 10:53 am)
#30 of 91 Re: Premium vs Regular [stbarton] by trispec May 01, 2006 (10:53 am)
Replying to: stbarton (May 01, 2006 9:24 am) I put 89 octane Shell gas into my RX-8 AT that was 20% full with the Shell 93 Octane. My MPG jumped from the normal 14.5 MPG to 16 MPG pure city driving. I'm going to continue mixing back and forth, 93 octane to 89 octane, to see if the MPG correlates consistently. Pathstar said it might happen, but I wasn't thinking it could be that dramatic of a difference in MPG. I tried the 87 octane once, and there was no difference.
#31 of 91 RX8 Mileage by carfanatic007 May 10, 2006 (10:31 pm)
I could never justify buying such a small car, that isn't as fast as the competition that gets such lousy gas mileage. The 350Z gets about 25 MPG. Even the Mustang GT gets better mileage and it is a V8! I owned a 1973 Mazda RX2. Fast little bugger, but it had oil burning problems. I wish they could work out the kinks in the Rotary engine. Seems like they haven't yet. Replies to this message: trispec (May 11, 2006 4:29 am) trispec (May 11, 2006 4:29 am)
#32 of 91 Re: RX8 Mileage [carfanatic007] by trispec May 11, 2006 (4:29 am)
Replying to: carfanatic007 (May 10, 2006 10:31 pm) There are not really any "kinks" in the rotary engine. Rotary's are designed to burn oil. Point of the rotary design has little to do with MPG. If high MPG is the goal, then buy a Hybrid that only a NASA scientist can fix.   The following are the points to the rotary engine design:   1) Simple design engine design with few moving parts raises overall reliability over time. A design life of 200K miles on the old rotary designs, a sports car engine, was unheard of in the complicated multi-value piston world of the past. The Renesis Rotary's design life is 500K miles. Racing a rotary engines means one re-build per season, where as racing a piston engines means re-builds after every race.   2) Much lower torque at low RPMs is a wear and tear saver on the entire drivetrain.   3) The drag racing mentality of torque heavy engine design, based on a NASCAR formula in the USA is just dumb. Go watch any VOD Car video as torque heavy monster cars drag off screeching burn tires, only to crash half a block down the road as they simply loose control of the poorly torque balanced car.   4) Engine weight and size eliminate frontend steer compared to the high center of gravity weight of any piston designed engines. Acions might go to the flat four and flat six piston designs of Porche and Subaru.

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