I see the possibility of exploiting this part of the tree by fully mobilizing your army. My intuition tells me it's cheaper to make a full infantry army of 30w motorized infantry with 2 motorized artillery and a support company of super heavy artillery (which is just art 3 but more expensive). This allows you to get all the benefits of the infantry bonuses while maintaining the speed of motorized warfare. You could either go down the motorized infantry branch of the mobile warfare doctrine or go for grand battleplan. Missing 2 -50% doctrine bonuses isn't a big deal. Mobile warfare will give you helpful speed bonuses, even better because motorized infantry get huge bonuses from percent increases. 10km/h + 10% is huge, and that stacks with other bonuses in your tree. Or go for grand battleplan for the big stat increases. Definitely add on a logistics company, a helicopter hospital company (because infantry takes lots of casualties on the offensive) and a maintenance company. Go for minimizing fuel usage and production cost in your MIOs. I'll be trying this out myself soon. See how it goes.
>Prussian LegacyAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
>>1899066>30w motorized infantry with 2 motorized artillery14+4 is just so much fucking better