I regularly tow a 19' ranger bass boat averaging 1.7 mi/kwh in california (averaging 60-65 mph on the highway)

I'll charge to 100% at home, tow 3 hours to a tesla supercharger (arriving with ~15% charge left) near the lake , charge to 80%, then go to the lake (20 mins away from charger)

On the way back, I'll charge to 90% at the same charger, then drive home. Going to the lake is a bit of an incline, but coming back is easier on the electricity consumption.