Tesla Road Trip Planner

How this is calculated

• Consumption starts from your car's rated efficiency (usable kWh ÷ EPA range), then scales with speed — 65 mph ≈ 1.00×, 70 ≈ 1.10×, 75 ≈ 1.20×, 80 ≈ 1.30× — and temperature (about +15% at freezing and +35% near 0 °F, a little more in extreme heat).
• Stops: you drive until the battery reaches your arrival buffer, then charge to your "charge to" level. On the last stop of a leg we charge only what's needed to arrive with the buffer — the way trip-planning software usually does. Real Superchargers aren't spaced exactly where you'd hit the buffer, so expect stops to shift by a few miles.
• Charging time simulates a typical taper curve 1% at a time, scaled so a 10→80% session averages the share of peak power you set. Below freezing it's 10% slower (25% slower for LFP packs, which also slow down below about 50 °F). Each stop also gets the "extra per stop" minutes for exiting, parking and plugging in.
• Driving time assumes you average about 92% of your cruise speed once slowdowns, towns and traffic are included. Overnight stays are not counted in trip time.
• Cost = Supercharger kWh × price + overnight kWh × destination rate (+10% charging losses) + the battery energy you started with, valued at your home rate (+10% losses). The gas car burns miles ÷ mpg gallons.

• Consumption starts from your car's rated efficiency (usable kWh ÷ WLTP range). WLTP is a gentler test than the US EPA cycle, so we first trim the WLTP range by 10% to get a realistic steady-speed baseline. It then scales with speed — 60 mph ≈ 0.91×, 70 ≈ 1.10×, 80 ≈ 1.30× — and temperature (about +15% at 0 °C and +35% around −18 °C, a little more in extreme heat).
• Stops: you drive until the battery reaches your arrival buffer, then charge to your "charge to" level. On the last stop of a leg we charge only what's needed to arrive with the buffer — the way route-planning software usually does. Real Superchargers aren't spaced exactly where you'd hit the buffer, so expect stops to shift by a few miles.
• Charging time simulates a typical taper curve 1% at a time, scaled so a 10→80% session averages the share of peak power you set. Below freezing it's 10% slower (25% slower for LFP packs, which also slow down below about 10 °C). Each stop also gets the "extra per stop" minutes for leaving the motorway, parking and plugging in.
• Driving time assumes you average about 92% of your cruising speed once roadworks, towns and traffic are included. Overnight stays are not counted in journey time.
• Cost = Supercharger kWh × price + overnight kWh × destination rate (+10% charging losses) + the battery energy you started with, valued at your home rate (+10% losses). The petrol car burns miles ÷ mpg (imperial) gallons, at 4.546 litres per gallon.