As did some other ads in that period, this one might be slightly playing on women's recently equalised status as voters in Britain, and the related perceptions (whether positive or negative) of the 'modern woman' which became rather a media fixation at that time.
Sunday Express, 13 July 1930, p. 11.
The text, in case you don't want to squint:
Woman takes the wheel
These are the days when women really drive. A car is woman's servant...not her master. And it's Pratts 'High Test'--no other kind--for the modern woman-at-the-wheel. Pratts 'High Test'...because it gives bigger mileage without costing more. Because it puts life inot the engine...power...snap...speed...sparkle, and always starts up instantly.'
Um...sparkle? Must be a chick thing.
Anyway, the next one is a bit more mysterious, in so far as the concept of 'motoring chocolate' is a new one to me.
Yes.The Best thing to go Motoring on
Rowntree's Motoring Chocolate is a delicious combination of the famous Plain York (or Milk) Chocolate with whole blanched almonds and raisins. It is made specially nourishing for all who enjoy motoring and the open air.
Must be those raisins.