A Colorado elk tag is around 500. Gas cost is dependant on price and distance and if you have riders. You eat everyday anyway so eating can be relatively cheap. If you have camp gear, you may be set. Look at the Colorado reg's and see which areas are over the counter tag areas. I took a map and transfered the areas using colored highlighters. Now get yourself a Gazateer ( topo map road map combo) and go thru the pages that correspond to the OTC areas. Look for public areas, look for areas that are limited access (roadwise) and that are in restricted zones. As I understand, some of Colorado is open to pretty much unlimited quad use, while other areas are not. I like to find areas that have a lot of drainages per ridge, not just a long mountain ridge. If you bump some animals and they leave the drainage, they can settle in the next one. Once you find a couple or more "maybe" areas, call the local game manager / biologist and warden. Find out their e-mail address so you can ask away and they can answer at their leisure. Works better that way. They know the area, the game numbers, the terrain, the hunting pressure. The fellow I spoke with was a gem. I treated him professionally and he was. Then...go get them.
I am not certain you always need to go three or more miles in. My favorite honey hole is about 1.5 miles from the trail head.
On the other hand....I very often get passed by the folks that are packing in....3-6 miles by horse back, camel back, donkey back...all the above. Sure, they see animals up there...but I always do also.
ChuckC