At "7 miles," you're right at the distance the car gets warmed up. Based on my experience:
1) Engine block heater - helps get the coolant up to efficient operating range.
2) Spoof coolant temperature sensor - (MAY NOT BE LEGAL) trick the car into using fuel efficient control laws. This may not bring the catalytic converter to operating temperature quickly.
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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