The Power of the 2.5 and the 1.6 are similar. The torque rise of the 1.6 comes sooner in the rpm curve. I think most of the mileage gain if any between the two versions is the difference in the final drive ratio in the two gear boxes. The 2.5 has a 3.21:1 the 1.6 has either 3.06:1 for the XL or 3.51:1 for XLT.
The 3.06 will give the best Mileage over all, but should you have the 3.51:1 you won't save money but you will have fun!!
I plan to mount my garage door opener In that thing,
I gave It a close look see and can place it with velcro squares In such a way that when I press on the closed sunglasses door,,Well It will appear closed to a casual glance,
anyway the door opener will work.
I have done this on other vehicles...