SHELL
... A WELL BALANCED DIET Both the car and the human body re spond to a well-balanced diet. The use of an ill-balanced motor spirit, with the hydrocarbons in the wrong proportions, may not prevent a car from arriving at its destination, but it will reduce power and mileage, and affect running and axeleration. Shell the well-balanced petrol, contains aro ma ics and naphthenes in the right pro ...