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Originally Posted by jajohnson
Your comment that it is not green is right on.....Why is HP important (unless you run at the peak of the HP curve all the time)? Why is torque important unless you are constantly pushing for a better 0-60 elapsed time? Why then does it matter the impact of octane on performance? The real key is what really matters to driveability as you measure it (most of us by MPG). Sorry.....but I obviously do not understand where you are coming from.
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Because ... sometimes it's just fun to put your right foot to the floor, feel yourself get pressed back into the seat and tear along the highway or some windy back road, which the abundance of power in the HAH allows for with ease. Another 10 hp and 10 ft-lbs would certainly help in that endeavour. Then when feeling slightly guilty about such wanton waste of fuel you can throttle back and still get 40 mpg + cruising sedately on the highway.
On the other hand, if the V-6 engine derates itself by retarding timing to avoid engine knock when using regular unleaded maybe it would be slightly more efficient using premium fuel instead of regular. This may be one of the few instances that premium actually does have a positive effect on fuel economy.