Ok, coming from not a native, but a "grew up in CO" boy, when going west up I-70, if you are going to be in the far right lane, then be damn sure you aren't the slowest guy in that lane. That is the lane for the trucks to struggle in. If you are a car in the right lane slowing down the trucks, then you are a @$$hole. Give them a break, they are driving huge, heavy vehicle carrying the things we love and need, and they have like, a million gears they have to shift.
Take the middle lane, and if you still can't keep up, then stop going to the mountains until you have fixed your car so it can get you there without holding up traffic. Trust me guys, it can be done; back in college I drove a 92 Buick century that was weak as :toilet:, and even with it being an automatic, I could trick it into downshifting so that I could accelerate up the inclines. You may overheat the engine, so pull off at the evergreen walmart and stock up on coolant and let it cool down before continuing.
I get nervous with so many of you suggesting people just stay in the right lane... I've seen way too many obvious tourists slowing down the trucks and causing traffic jams because of it.