What kind of range impact to expect, 3 dirtbikes, 3 dudes, 3 motocross bags of gear.

[AMG]

3 men at say 200lbs each (600)
3 dirtbikes at 250lbs each (750)
3 bags of gear, let's call that 125lbs.
1 guy (driver) is always expected, but the total there is approx 1500lbs total payload. What kind of mileage impact is reasonable in Southern California moderate weather (I don't ride dirtbikes if its freezing), so let's just say 60F outside. Also, does the physical size of the dirtbikes themselves in the back of the bed w/ the tailgate down add significantly to the mileage per kWh hit or likely since they are about as high as the top of the front cab, not really something that is worth measuring (aerodynamics of 3 motorcycles)?
Thx

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[SpaceEVDriver]

It depends on what roads you’re driving.

If you’re driving mostly on the freeway? The extra mass will not be noticed much. It will only matter when you’re accelerating up to speed.

If you have a lot of start-stop, decelerate/accelerate driving? There will be more impact. It could become significant.

The mass of the vehicle is mostly irrelevant for long-distance range once you get it up to speed and if you keep a steady speed. But if you’re changing speed or direction a lot, then the mass matters a lot more.

Are you going uphill much? Extra mass matters when you’re fighting gravity.

The additional air resistance may matter a bit, but I wouldn’t expect it to cause a huge range hit unless the bikes stand several inches or more above the roof of the cab or beyond the sides of the bed. I’ve never seen convincing research that shows whether the tailgate up or down matters for long range efficiency. The bikes in the bed of the truck will make a bit of a difference, but I haven’t noticed it mattering when I have stuff in the bed.

My guess---based on incomplete information---is that if you’re taking the freeway to a site that’s only a couple of miles off the freeway, you’ll notice not more than a 2-5% decrease in efficiency. You can save more than that by dropping your speed from 75 mph to 70 mph and using cruise control. Slowing from 75 mph to 70 mph improves efficiency by about 8-10% and only increases time on the road by 5 minutes per 100 miles. You can recover that time at the charger by needing to recover less energy.

 

[Chillguy]

I usually get around 2-2.2kwh/mile when I drive around town. BUT when I hit the road and start driving 75-80 mph speed then the efficiency drops to 1.8-1.9 kwh/mile. I just love that crazy acceleration! And "engine roar" too...
It is like driving a brick shaped truck, the faster you go the more air mass you will have to move. I once used a hitch installed cargo carrier and believe it or not but it significantly lowered my efficiency down to 1.6 kwh/mile!... Which is super odd because I get better mileage towing my double axle 14 foot open trailer at 1.7kwh/mile... When I tow my enclosed 14 foot long 7 feet high trailer I'm down to 1.4 kwh/mile, just FYI....... So as you see I wouldn't be concerned as much you packing up your gear and people as long as you can maintain 65-70 mph speed max you should be at 2+ kwh/mile. Plan out your charging for no more than 250 miles (in my case that is) and you should be extra fine, lol.
Enjoy your trip!

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