I know for a fact that the V8 is only faster on the track. I never intend to go there and drive my SUV on it even if I did go there to race. In traffic, where I do drive, when I drive the V6, I'm faster getting around town then my buddy who has the V8, and when I drive his V8, I'm faster than he is in my V6. Because we all know that driving fast in traffic has very little to do with HP or torque. It's about making the right decisions and which lane to be in. It's knowing 47 mph in the 45 mph zone through town will ensure you catch all the lights green all the way through, and if you come to that one intersection where traffic is to the bridge, then turn left and go the back way, you'll save 10 minutes.
We also did a pretty good side by side comparison, going back and fourth to the shop, exact same driver and driving style. V6 gets driven like it's stolen. With no thought to fuel consumption, and we average 18.5-19 mpgs consistantly. The V8 however, if we drive it with the exact same driving style, then we both average around 13-14 mpgs. If we drive it "carefully" then we can get about 16. So it works out to about $85.00 to fill the V6 every 10 days, and about $98.00 every 7 days for the V8. Plus he's about to have to do his spark plugs for the first time, Dealer quoted $375.00 for that.
If the V8 was significantly more powerful than the V6, I would have given it more consideration. The problem I saw is that the V8u is still slow. A Toyota Rav 4 V6 is faster then the GC V8! atleast in the V6 I don't feel I have anything to prove. I can't imagine having that big V8 thunder being pulled by a Toyota Venza V6 station wagon!