Well, I'll point out that a lack of fuel and air power did not prevent the German's from launching a major offensive in the winter of '44-45... although it did play a role in preventing said offensive from succeeding.
German fuel supplies were precarious—those materials and supplies that could not be directly transported by rail had to be horse-drawn to conserve fuel, and the mechanized and panzer divisions would depend heavily on captured fuel. As a result, the start of the offensive was delayed from 27 November to 16 December.