How to determine type of trim for Mazda 6 Sedan

The i and s denote the engine. The 4-cylinder engine is known as the 6i, and the 6-cylinder engine is known as the 6s. For 2006-2008, I believe there were 4 trims: Sport, Sport Value Edition, Touring, and Grand Touring. Don't quote me on that, though. I also believe the Sport trim disappeared sometime in the middle of that...SVE became the base option. Post a picture of your car and we might be able to narrow it down, but basically, if you have leather, Bose stereo, sunroof, heated mirrors, automatic climate control, 18" wheels, etc. you probably have a GT. If you have cloth seats, manual climate control, regular stereo, etc. you probably have an SVE.

Sounds like a Sport VE to me. That's basically the same car I have.

Really the only exterior telltales on the 06-08s were the grill and the wheels, and the grill disappeared at some point. They all got the sport grill. I think the GTs had 18" wheels throughout all 3 years, though.

You definitely have a 6i, though. The 6-cylinder engine was paired with a 6-speed transmission (automatic...I think manuals were 5-speed). In addition, it had v6 badges on the back and sides. The 4-cylinder didn't have any badges related to the engine. You also definitely have a sedan.

Well, automatic transmissions still have speeds, so describing it as a 5-speed automatic is correct.

In 2006 (it may have been 2005), the 6i was upgraded to a 5-speed automatic transmission, and the 6s was upgraded to a 6-speed automatic transmission.