All the manufacturers have little tricks they use to claim "best this" or "better than that." You really can't take any of their advertising at face value.

I know another little trick that Ram does is claiming their Hemi's hp/tq and fuel economy numbers on mid-grade gasoline (89 octane), rather than regular 87 octane like Ford does. Therefore, if you use regular gas in your Hemi Ram you likely aren't getting the full hp/tq and fuel economy that you think you are.