Does anyone have something similar from GM????
I agree that every manufacturer will always highlight only the strong points of their product; but I do believe that this is a genuine test.
A UK based program 'Fifth Gear' mentioned about how intense the testing was done on the Volvo based engine for the then new Focus. Apparently they ran the engine at max revs; just before the redline, till the engine did about 100,000 miles. Even after all that abuse, still the engine remained as strong and gave exceptional figures at the dyno.
'Fifth Gear's reviews are independent from the manufacturer and accurate, so we can take their word for it on that.
Now I wish there was a similar test from GM or an independent test for both.