Four-cylinders with the manual transmission are the most economical Mazda6 models, being EPA-rated at 21/29 mpg city/highway. Automatics surrender just one highway mpg and are classified as Partial Zero Emissions Vehicles, or PZEVs, in the eight states that require California emissions standards; in other states they are merely Super Ultra Low Emissions Vehicles (SULEV).
The 3.0-liter V6 in the Mazda6s greatly increases the fun. It benefits from continuously variable valve timing (VVT) for its intake camshaft, providing strong torque at low rpm, a willingness to rev, good gas mileage, and nice sounds from the air intake and dual exhausts. The Mazda V6 doesn't feel like it has as much low-rpm torque as the Toyota and Honda V6s, but it loves to rev and it's a lot of fun to drive.
Both engines are made of aluminum to keep the Mazda6 from getting too heavy, which it isn't, at 3378 pounds for the V6 automatic sedan.
The six-speed automatic is really smooth, yet shifting is crisp. All those gears provide improved gear spacing for the V6, keeping it in its power band under all circumstances. Having six forward gears allowed Mazda engineers to select low ratios for first and second to maximize off-the-line acceleration, tall top gears for effortless cruising, and mid-range gears optimized for snappy acceleration from highway speeds. The Sport Shift mode allows the driver to shift manually by pulling back to upshift, pushing forward to downshift.
Handling is excellent. The Mazda6 doesn't lean much in corners, body roll being nicely controlled by the front and rear anti-roll bars. The Mazda6 comes standard with a sports suspension with double wishbones up front, a lateral-link layout in the rear, and coil springs all around. Tires on even the base models are now generously sized at 215/50VR17, with lower-profile 215/45WR18s on V6 Grand Touring models.
Grip is tenacious, right up to the point where the front end pushes, telling you to lighten up; and this understeer doesn't occur until you've reached competition-level speeds. Other mid-size sedans lose grip far sooner than the Mazda6. The amount of power-steering assist backs off the faster you go, to give good road feel, although it's still on the light side at high speeds.
The Mazda6 doesn't feel as refined as the Honda Accord does. Ride quality is generally good, bit it can get a little jouncy on certain types of pavement and some road vibration comes through. Road noise is relatively pronounced on broken pavement, especially with the Sport trim. Wind noise comes through as well; we noticed this was particularly true with all but the base model and suspect the aerodynamic enhancements that come with the Sport VE and above may be the cause. But none of this is as uncomfortable as it sounds when described in print, and the upside is that the driver is closely attuned to the driving conditions.
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