Seven people are usually needed to open the
doors of a full-service wash. This includes greeter, vacuum/drive-on/prep, cashier, drive-off, customer service rep, finisher and site manager (working). Based on a ten-hour day and average hourly wage for each position, labor would be $682.
Only five people are needed to open the
doors of flex-serve. This includes greeter, tunnel attendant, two finishers and site manager (working). Labor for this gang would be $482.
$482 / $682 = 70.7%
Next, apply some operations. In this case, 115 cars times $17 average sales equal revenue of $1,962.
Full-service = $682 / $1,962 = 35%
Flex-serve = $482 / $1,962 = 25%
This gives an indication of the difference between full-service and flex-serve labor models.
Extrapolating the general assumptions beyond this point becomes difficult because flex-serve adds units of labor at a lower rate than full-service as volume increases.
For example, on a 225 car day, full-service labor might be 37.5% of revenue whereas flex-serve labor might be 22.5% of revenue.