Last post on Oct 07, 2010 at 4:27 AM
You are in the Mazda CX-7
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Mazda CX-7, Car Buying, SUV
#16 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [wwest]
Feb 09, 2010 (9:03 am)
That may be true, but here's what you do get (on the "i" version):
Engine type: 2.5-liter DOHC 16-valve 4-cylinder with VVT
Horsepower: 161 hp 6000 rpm
Torque (lb-ft): 161 lb-ft 3500 rpm
Redline: 6500 rpm
Displacement (cc): 2488
Bore x stroke (mm): 89 x 100
Compression ratio: 9.7:1
Fuel system: Electronically-controlled multi-port fuel injection
Recommended fuel: Regular unleaded
Valvetrain: 4 valves per cylinder with variable intake valve timing (VVT)
Engine block: Aluminum-alloy
Cylinder head: Aluminum-alloy
Fuel Economy: Front-wheel drive (city/hwy) 20/28
The 2.3L has "Direct-Injection Spark Ignition (DISI)" and I'm not sure if that is Mazda's version of DFI. However, the turbo kills the MPG on the "s" version.
So, if it's not offered...
In the end, it is the "i" version that I am interested in getting drivers feedback.
#17 of 33 2010 2.4l turbo mpg higher than 2009?
Feb 16, 2010 (6:56 am)
I was looking at a 2009 GT FWD used CX-7. The owner kept the window sticker and it showed a mpg rating of 17/23. While the 2010 2.4l turbo fwd rating is 18/25. Curious as to why the difference?
#18 of 33 Re: 2010 2.4l turbo mpg higher than 2009? [ddmtb]
Feb 17, 2010 (9:51 am)
The severe detuning/derating of the 2009 and earlier 2.3L turbo engines provided a LOT of room for improvement. All they had to do was reduce the rate at which boost began to rise, keep the turbo wastegate open a bit longer into the "POWER" throttle region.
With a fairly simple modification to the engine, techniques(***) already in modern day use, the 2.3L turbo engine could easily reach, and probably exceed (30MPG..??), the hwy FE of the NA 2.5L.
*** The latest Toyota HSD (Hybrid Synergy Drive) version uses a multi-mode engine technique, Otto mode, 13:1 compression ratio, for light engine loading, hwy cruising, and transitions into Atkinson cycle mode, 10:1 compression ratio, for POWER/Boost throttle openings.
#19 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [howd2010]
Feb 18, 2010 (9:00 am)
Driving a 2007 CX-7 turbo AWD w/ 55,000 miles. Requires premium fuel. Currently getting about 20 mpg in city driving. Best ever received on the road about 24 mpg. Mix of city/hwy. about 22 mpg. Running about 2400 RPM at 75 mph. Engine does not seem to work hard even at 90 mph. Considering this is a 4,000 lb vehicle w/ AWD, can't really complain about the performance/fuel mileage. w/turbo. Been a good vehicle, besides maintenance, only needed a battery/new tires at this point.
Only real complaints would be the interior plastics-(sounds like the 2010 has some needed upgrades) and a little more legroom in back would be nice.
Change oil about 3,000 miles--transmission fluid/transfer case every 20,000. Remember, most motorists don't understand that fluids need to be changed BEFORE they get real dirty. Preventative maintenance is quite inexpensive compared to the alternative.
Would be interesting to compare performance of the naturally aspirated 2010 model compared to the turbo. Has anyone driven both?
#20 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [fonefixer]
Feb 18, 2010 (12:34 pm)
If my ATF in my transaxle and PTO were dirty, or burned, enough to warrant changing even at 100,000 miles then I would expect something to be VERY wrong inside there.
#21 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [fonefixer]
Feb 19, 2010 (8:12 am)
I have the same vehicle as you. I get about the same mileage, although I had hoped it would be better. My problem right now is a shaking in the steering wheel starting at about 75 mph. I had the wheels rotated and balanced, but it did not fix the problem. Could warped brake discs cause this? I bought the vehicle used so I don't know much about how it was maintained. It only has 25k miles on it.
#22 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [nace818]
Feb 19, 2010 (9:41 am)
Besides rotation/balancing--would look at warped rotors. Would make sure the balancing was done correctly before going any further.
#23 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [wwest]
Feb 19, 2010 (9:51 am)
You let your transmission fluid go 100,000 miles, I'll change every 20, lets then take them both apart and compare wear/tear. I'll bet you will need a rebuild-- mine should last the life of the vehicle. Just a guess.
#24 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [fonefixer]
Feb 19, 2010 (11:05 am)
yes I agree, I'm going back to the same shop tomorrow. Of course they will say the balance is correct.
#25 of 33 Re: Mileage on the 2010 CX-7 with 2.5L [nace818]
Feb 19, 2010 (12:16 pm)
If you had loose front end parts--it should "shake" at speeds less than 70 mph, especially when braking/cornering. Warped rotors should only cause vibration when braking--not steady driving--have the balance checked again!