Saving 12 Watts is better than a kick in the teeth... but you will not perceive any major benefit in daily riding unless you are riding long distances/are concerned about conserving your energy or competing in timed events that you intend to win.
Two riders on a 0% gradient, and all other other things being equal, but one putting out 100 Watts and the other 112 Watts will be travelling within 0.75mph of each other. In reality, the rider with 'slower' tyres will be working harder trying to keep up and maintain a similar speed and the effort required to do so will be inperceiptble at low speeds. The rider with slower tyres may end up being fitter than the cyclist with 'faster' tyres. When our fateful rider with slower tyres eventually upgrades to faster tyres for a special race event, they will be better trained than our rider with more expensive equipment, and thus you'll actually benefit by riding that slower tyre in your training rides.
So, if you intend to compete and beat your pals in a race effort, switch to the better rolling tyres, but for every day training and riding, stick with the budget/economy tyres so long as you are satisfied they meet your other requirements (puncture protection/durability/cost per mile of use).