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No, go I-35 North til you hit Kansas, and then go West on I-70.
Did this route a few years ago. I did it just to try it to see if it was any better than the old tried and true Raton route. It's a better route if you're towing a trailer because it's completely flat until you get to Denver. But, it's a long haul. And with kids in the car, ... We stopped and spent the night in Wichita.
My parents used to do I-35W to 287 to I-25 and would make it from Waco to Denver in about 12 1/2 hours of drive time in the summer. Google puts that route at 858 miles. That's an average of 68.64 mph. So maybe they meant 13 1/2 hours and called it 12 1/2 after the change from CDT to MDT. That would be a more believable 63.55 mph average.
I made several trips between Austin and Denver. With kids in the car, it was 14 hours. Austin to Lubbock was 6 hours, Lubbock to Denver was 8 hours. Or, going the other way, Denver to Amarillo was 6 hours, Amarillo to Austin was 8 hours. We'd always go via Brownwood and Abilene.
Just for kicks, I checked the distance from Killeen to Denver via Wichita. Yeah, 1018 miles in 12 hours gives you an average speed of 84.83 mph. Not gonna happen.
My personal best long distance run was 800 miles from Dallas to Fort Knox in 12 1/2 hours (including stops) for an average of 64 mph on 2 January 1994. More recently (24 October 2006), I
drove from Los Angeles to The Bay Area in just over 4 hours. I averaged 78.46 mph on that trip (340 miles in 4:20 ironically). On jaunts between Los Angeles and San Diego, I've been able to average about 80 mph over a 150 mile route through the Inland Empire which included a solid hour at 100 mph. It's just impossible to keep up an 85 mph average speed over a great distance like that from Killeen to Denver. You have to stop for fuel, bathroom breaks, etc.
Also had many great runs between Brady and Llano back in the 1994-1995 era. But not at night and not during deer season. Came around a bend one morning and almost ran into Hogzilla. That'll make you think twice about speeding.
[This message has been edited by HollywoodBQ (edited 6/6/2011 9:32a).]