If your kia is in good tune and you have a good cat the trick to hills in to shift down before you hit the hill or start loosing speed.
When my Kia was new we took a trip with some friends that had a 93 S10 blazer with a 4.3 V6 and an auto. He kept loosing me on hills untill I started shifting down at the bottom. I could out run him on any hill after that. I flew by him in 4th gear on one hill, he said he had in to the floor in 2nd gear when I went past him. Don't be afraid to your the full range or your tach, the engine can handle it.

Dennis

95 Sportage, gone but not forgotten.
98 Jeep TJ, 4" Zone springs with RC Long arms, Ford 8.8", 4.56 gears & Detroit locker rear, D30, 4.56 & Detroit Trutrack front.