There isn't for two reasons:
1) I don't want to add any more complications to it, it's a competion based only on economy, requirements are here only to avoid exaggerations.
2) These cars don't need an high utility score, they only carry the thing they can deliver in an hour (considering the shipping preparation), you don't need a truck to take home your grocery. IRL (yes, this service really exists, I was "inspired" by Amazon Prime Now) they even use scooters.
At first that numbers are from a test car, but trying the spreadsheet funcionality i changed it, now they are 80% random.
Watch out, with a very fast car you can have a good review and Mr. Jett Basics can nominate your car his favourite, but you don't take any advantage in the main competition, they will buy the more economical car.
I'm glad you like it, I spent few hours to make it pretty (with all the conditional formatting and help functions).