I'm hiring a car from Cablo. In the kms quoted on my fixed quote can I use the car for local travel before I leave the city

Cablo car rental services for outstation is meant for outstation /intercity services only. So when you book a cablo for local sightseeing then you can use the same for local services. At the same time if you book a car for outstation then it will be for outstation services only and local sightseeing  can not be allow.
Alternatively there is type of services you opted for is the main point and you need to follow the trip route as per that plan only. If you buy our budget services with cheapest price then the services is restricted as per the terms only.
In case you buy a service that is curated and Cablo+ tag then you will get additional support and local sightseeing allow for the same rate per KM.
Along with that the considered rules and policy of the state where you are visiting apply, that include the limitation of ply vehicle from outside state, additional penalty or restrictions that apply time by time by visiting state.
Special Area – along with that there is some special area where  normal vehicle rental scheme and price not work and for those location trip you need to go with special packages only.
Some Example of those location are as below
Char Dham yatra – for chardham yatra you need to go with special price based rental packages that is restricted by days and other terms hence any vehicle that is going for the normal area can not allow for the Chardham yatra.
Leh Ladakh – prices for the Leh and Ladakh area is different and hence you can not able to go Leh with standard Prices of Vehicle
Rohtang Pass – When you want to visit Rohtang Pass , Our vehicle will not go there and we can provide you alternate vehicle directly from the Manali on additional Prices. Hence the Alternate Vehicle cost will be extra and normal vehicle will not go there.
Hemkunt Sahib – For hemkunt and Valley of Flowers normal vehicle rate not apply hence you need to go with package

All vehicles you hire are quoted with a fixed amount of kms associated with the exact itinerary listed in your confirmation. Usage of the vehicle outside of the documented itinerary and/or beyond the listed kms may be subject to additional charges. Your use of the vehicle is limited to the activities that are clearly listed on your booking confirmation (booking contract)