Peaking instead of tapering in marathon training may improve performance

I recently read 2 interesting articles in Running Times magazine (Nov issue).
One is written by Greg McMillan (USATF certified coach and exercise physiologist) and addresses an important issue: should we taper or peak during the last phase in the marathon training program?. The article gives you useful tips about the prerace and race day strategy before your marathon.
The second article talks about combining carbs in various ratios (example glucose-fructose 2:1) and their arguably superior efficacy as compared to just having a simple carb such as glucose.
Several examples are given (Roctane endurance gel for example or Power bar). This article talks about the pros and cons of these combinations and the mechanisms by which these combined carbs may lead to an increased transport from the gut to the muscle, and therefore, improving your performance.