Actually one interesting thing about that...
My mole of an ex used to work at Cannon Hill.
I'd drop her off at work in the morning, and then make my way over to work at the airport.
One week I did the gateway (timed each run, counted up tolls and fuel at the end of the week)
Next one I went over the Story Bridge and through New Farm (timed each run, counted up fuel at the end of the week)
I didn't get a single gateway run under an hour, and it cost me more in fuel and tolls. Story Bridge runs took between 27-38 minutes depending on how many red lights I got.
This was not in school holidays or anything either, just normal work/school days.
Oh, and driving through all the suburbs there were school girls to look at. Faster, cheaper, and JB