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Planning trip with bikes on roof rack

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I’m planning a day long drive with bikes on a roof rack and wondering what adjustments to the planned assumptions would be good. In the past, I’ve seen the energy drop a fair bit faster than driving without the roof rack but I didn’t drive far enough to figure out how to adjust the assumptions. 
 

Tesla model S75

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I am not surprised to see that level of reduction, just curious if there was someway I could get A Better Route Planner or the in-car system to predict my range better when using a roof rack. Would just adjusting Reference Consumption do that? So for example if I assume 324 wh/mi, do I multiply that by 1.33 and instead use 430 wh/mi when I've got the roof rack on?

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The absolute best way is to set up live data, put the rack and bikes on, and go for a test drive.  We'll dial in the consumption very quickly (and not just the one number, but the whole consumption curve across all speeds).  Within 5-15 minutes of driving we should have a very reasonable model which is quite accurate for planning (assuming you spend a little time at each speed).

The "Reference Consumption" is just one data point on the consumption curve - specifically at 65mph, adjusting that directly just moves the curve up and down to match the number you set.

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