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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 Std. Range Plus Model 3 - 134 MPG3 || 2014 BMW i3-REx - 117 MPGe, 39 MPG
JuiceBox 40 Pro (240 VAC, 40 A), KHONS portable (120-240 VAC, 12-32 A)
Retired engineer, Huntsville, AL ( five times AutoPilot saved.)
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