I wish this would work, but if 12 to 17 minutes a day, at a hard "race" effort was all it took, we'd all be great riders. Unless you're training for only very short track sprint races, having a high power output for 15 minutes isn't going to be enough. For road events, you need real aerobic efficiency....the ability to cruise at a good speed for hours at a low HR, while still having enough energy reserves for a sprint finish.
Your short routine might raise your VO2 max, but don't believe it's going to do much for building your aerobic energy systems. Try it for a month straight, then go out for a 30 mile group road ride and see what happens.
The rule of "specificity" says that for your body to adapt to long road events and races, long distance training is going to be required. There is a reason Lance and the pro's do endurance rides of 4-6 hrs at 65% max HR or less, racking up 15-20,000 miles a year or more. Our top local club riders and racers are doing 8K miles year or more....about 30 miles/day average, 5-6 days a week.