Sorry, when a product is created, we try to make it as universal as possible and as well optimized as possible. Therefore, every time we have limitations. Either the product is simple and fast or universal. The same for OrdaSoft joomla cars
In your case - for these fields we use:
in the __vehiclemanager_vehicles table
`city_fuel_mpg` varchar(5) default '',
`highway_fuel_mpg` varchar(5) default '',
therefore, these fields have a 5 character limit. You can change this in the database.
Or use other fields to override
Things get even worse with quotas: single quota and double quota are used everywhere in HTML - so it's better if you write them as the words "inch" or something else...
Also if you need change other fields or layouts, May be better for you will check our Joomla CCK
But there better start from any our template(where you will see already created some data structure), as example from Joomla Blank template
- so there you easy may change any fields any layouts - everything. And if there all will good for you we will can replace you Vehicle Pro version to CCK Pro version.
And, of cause, we will happy help to you with any questions