Typically a laptop will consume less power than its adapter will allow for. So in your case it will normally consume less than 65W. In normal operation it should not consume more power than the adapter sold with it can supply.
Crush is correct Antman. The 65 watts or 3.4 amps that the power brick is the top of it's draw curve. The rated numbers are not static. Your laptop's max draw is 35 watts or 1.8 amps assuming the dc voltage is 19volt. Your laptop will consume around 60 to 70 percent under a heavy workload so your power brick will only feed the power required.
I am all about low power systems now. Without spending any money, I am going to replace all (but one) of my systems with 15W or less CPUs. I will have no CPU cooling fans. Joli will need the laptop next year for Bring Your Own Technology. Third graders need PCs in 2016.
I have a Kangaroo PC running WindX on a 4W Atom x5-Z8500. Makes a great smart TV. 2GB sux.
So, I am thinking about spending $160 on the Kangaroo+