Written By: Bitumen, dense, highly viscous, petroleum-based hydrocarbon that is found in deposits such as oil sands and pitch lakes (natural bitumen) or is obtained as a residue of the distillation of crude oil (refined bitumen).
  About 3.5 hours-maybe 4 depending on road construction. The hardest part is getting out of Miami to Key Largo-then it's a 2 lane highway through all the keys to Key â¦ West with alot of traffic lights in between. If you are coming from Miami-definitely take the toll road.
Gas cost estimates for this Miami to Key Largo trip. If you were travelling in a vehicle that averaged 35 MPG and were paying $3.54 per gallon for your gas then the cost for a trip based upon an estimated distance of 50.4 drive miles from Miami to Key Largo * in gas would be in the region of $5.1 USD.