Good point, Howard. But after you drive one of these for a little while, you'll be amazed at how other cars seem to appear from nowhere regardless of where your mirrors are set. (For instance: "lane hoppers" crossing behind you from the Rt lane to the left lane when YOU'RE in the "middle" lane. In a normal car, you'd see 'em easily thru the rear window. Not so in the GT. Especially if that car is another 2 seater.)
The proceedure Kierkink outlined is my std lane change method ... minus the "floor it" part. Regardless of what my mirrors say, I always assume there's a car off my qtr panel (because 90% of the time - there will be) ... so I tap the accelerator, THEN signal, then change lanes. That way my GT has at least 3 lenghts on "the other guy" B4 he can react & play "cut off" games. ( I get real tired of that game real fast.)
I don't ever trust what mirrors tell me. I always check "over my shoulder" first. But, in a GT it's pretty much a wasted effort. Hence my "tap & go" lane change method. THAT works everytime.:cheers