Does the upgraded MBA 11'' from 1.4Ghz to 1.6Ghz affect the battery life?

Im looking into buying 11'' MBA and i still cant deside if i should upgrade the CPU.
Surely i will upgrade the RAM to 4GB.
But Apple Store staff adviced me that if i upgrade CPU to 1.6Ghz it may reduce the battery life from promised 5hrs to around 4.5hrs... Is that true? Personally i think that is maybe not really true, cuz normally any OS have an option to control and set up a limit of the CPU performance and frequency speed in regards to manage the baterry life... it even can be adjusted either manually or automatically.. am i right? And actually if you dont use CPU intensive programs so it won't consume more power, right? And even in such case also you can set the limit of the CPU performance to save the battery...
So does the upgraded CPU affect the battery life or not ?
And another matter - will the upgraded CPU get overheating sometimes and will it be "throttled" to control overheating ? as i heard...

Higher GHz = More Power = Lower Battery Life
Personally i think that is maybe not really true, cuz normally any OS have an option to control and set up a limit of the CPU performance and frequency speed in regards to manage the baterry life...
And actually if you dont use CPU intensive programs so it won't consume more power, right? And even in such case also you can set the limit of the CPU performance to save the battery...
If that were true, then why pay the xtra $100 for 1.6 GHz???
So does the upgraded CPU affect the battery life or not ?
Yes

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