Hi Gail.
Firstly, charge the car to 100%. There is no real evidence that charging to 80% is any better for the battery. It seems that the battery likes to be charged up and discharged fairly quickly soon after.
Secondly, the LEAF will not get 120'od miles on a full charge (unless you drive a constant 20mph).
Realistically the LEAF has a range of 80-90 miles. This is driving economically. Minimizing motorways, and if you do use motorways keep your speed at 60mph or below. With very little heat being used to warm the cabin also.
The main things that will reduce the range of the leaf are;
- Driving uneconomically - Accelerating hard, braking hard, not reading the road ahead and not coming to a gradual stop (not making use of regenerative braking).
- Speed - When you drive above 55mph you will notice you will be using more energy as the LEAF isn't very aerodynamic.
- Wind - again, as above with aerodynamics of the car.
- Rain - The rolling resistance of the tyres increase when there is water on the road, this results in more energy used to get through the water.
- Heat - Turning the heater on uses energy, as much as 3-4kW in the gen 2 LEAF. Even more if you have the gen 1 (not sure how much energy it uses)
.