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SUVs Mazda CX-7 Mazda CX-7 Real World MPG
361 messages, Last post on Jul 29, 2009 at 9:29 AM
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Replying to: stingray66 (Jun 11, 2007 9:08 am) |
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We have owned our CX-7 since last Oct. 2006. The last two long trips taken were in Oct. and Dec. 2006. Gas milage was over 24mpg overall for the two trips. Did have synthetic oil put in in Dec. Castrol Syntex 5W-30W. Our in town milage in a very congested med. size city has been running 17.25 - 18.0 mpg. I did try a tank with 89 octane and my gas milage dropped to 15.8mpg. Premium 92-93 octane use Shell mostly prices have come down from $3.29 per gallon to $3.15 per gallon. The performance is so much better with Premium gas. The Turbo charged engine has been used in other models , Mazda speed 6. The CX-7 has been detuned to 244 HP, 258lbs of tourque. |
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The dealership we purchased our CX7 from fills every car they sell with regular fuel. I'll bet most dealerships do the same. After running the tank down half way I filled it with plus grade. We drove 140 miles in heavy (Oregon) rain at 69 mph and averaged a solid 23 mpg. I'll try premium and see what affect it has. So far I haven't noticed any pinging even while running regular. I did however notice it ran better on plus. So I am expecting even better results from premium. I'll change the original oil at 2000 miles. Then I'll run a synthetic blend like Syntec for 3000. After that I'm going to use ELF full synthetic. I've used it for a year or so in my Chevy SS V-8 pickup with great results. I picked up 1.5 mpg (freeway) by changing to ELF. Also it's formulated to run 15K per change. I run it 7K and it comes out as clean or cleaner than standard oils at 3500 miles. 
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Replying to: rbmotox (Jun 12, 2007 8:23 am) Most new oil will get "dirty-looking" within days of use, and the coloration is more from cylinder blow-by and results of the combustion process rather than the oil degrading. So, you have to wonder, if it is a given that your engine makes "soot" and your oil comes out clean, without that soot in it - where did the soot go? At any rate, I totally agree with the notion of using full-synthetic in a turbo engine if you've purchased the car and plan to keep it a while. I've got two turbos in my garage now, and the older of them has been on Mobil 1 for 90K miles. I'd expect to find clean innards - relatively speaking, anyway - if I ever broke into the engine (knock on wood). 
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Replying to: carlitos92 (Jun 12, 2007 3:53 pm) It's true that the only "real" test is to send the used oil to a lab. Often the discoloration can be carbon, ash, aluminum oxidation, and a number of other things. My feeling is that if the oil looks cleaner and still "feels" oily compared to other oils I've used then that's a good thing. I have friends who own an oil distribution business. I've been lucky enough to attend some of their meetings with various manufacturers. It's true they ALL can tell you the virtues of their product and why it's better than the rest. What's interesting is they all agree that modern oils, especially synthetics, should be run from 10 to 15K before changing. I haven't been able to wrap my mind around that interval yet. That's why I opted to run the oil in my truck for 7K. I'll do the same in my CX7 and post my opinion. I'm curious to see if my mileage increases just by changing to ELF synthetic like my truck did. For now though my CX-7 is NEW and sure is COOL! 
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Replying to: rbmotox (Jun 13, 2007 2:27 pm) |
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Not to rain on everyone's parade, but I have yet to get over 22MPG on any trip, 100% highway or not (AWD model). The lowest has been ~16MPG in city driving and average is around 18. This is certainly dissappointing and something I would recommend new buyers keep in mind. Many larger vehicles do better than this. I am not an aggressive driver, although I probably do drive somewhat faster in this car than any other vehicle I have owned. Driving style doesn't seem to affect the poor mileage any. I did a test on a partial tank where I tried to keep the RPM's down when starting off at stoplights etc (tried to keep RPM's around 2k or less - really conservative driving). I got 15.8 MPG on that test (100% city). I'm wondering if I'm missing the latest PCM flash and if that would improve the mileage. I did have the CEL light, but that was for the gas cap and hasn't come on since it was fixed in December, so I don't suspect a bad throttle plate thingy. Overall the mileage seems to be off by about 2MPG consistently based on EPA ratings and what others are reporting here.
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Replying to: rex10 (Jul 02, 2007 4:18 pm) Maybe more air in the tires or less weight in the trunk or a new air filter will get you another mpg or two? |
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Replying to: rex10 (Jul 02, 2007 4:18 pm) I average about 300 miles to a tank full. I don't measure or worry about MPG, as that wasn't a consideration or concern when I bought the CX-7. I simply "zoom-zoom" wherever I go and enjoy the car. IMHO, fretting about MPG for the CX-7 is only going to put more gray hair on your head. Vince. |
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Replying to: wmiii (Jul 18, 2006 4:49 pm)
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