Our Auto pricing is 8, 9, 10 & 12 and has been this way for at least 3 years. While volume is definitely down, our average ticket has not waivered. Lately I have been seeing Laser washes around us charging either 9, 10, 11, & 13 or 9, 10, 12 & 14! I have been through all these washes and the quality is typical touchless and the 'show' is less than dramatic. No thick triple foam or vibrant colors or fragrance which to me is at least half the touchless experience. I don't know the operators, so I don't know where their avg ticket is. What do you think the average ticket should be to indicate if $13 or $14 is too high or a smart strategy?
Not sure about pricing in your specific area, but one method I have always employed is making the top wash look attainable and as if you are getting the best value by purchasing it.
When you price 9, 10, 11, 13 or 8, 9, 10, 12 - you are asking the customer to spend $2 more to upgrade from the penultimate wash to the ultimate wash. A pricing structure o t 8, 10, 11, 12 separates the top two washes by only $1, thus showing the customer how much more they get (since it is usually loaded) for the top package.
Another advantage I have found to this pricing structure is that is does separate your economy, quick, bargain, cheap (whatever you want to call it wash) away from the others with extra services. This highlights its value as a cheap wash with no extra services.
You might add two services between your top two washes - say undercarriage and triple foam. The customer then sees that they are getting two extra services for $1 more. You might ask, then doesn't that make the services look cheaper? No - it is about package pricing - they are already spending $11, so as a value or bargain to them it is only $1 to add the top two services. In my experience, it draws more people to the top wash. Their choice becomes only $1 more for the top wash instead of I can save $2 and still get almost the best wash.
Naturally, each extra service would be much more if it was sold a-la-cart, but we are talking about the menu packaging model.
Just my thoughts.