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Doing 70-75 MPH and assuming a flat roadway, in fair weather I would say you'd get between 35-40 miles of EV range. Speed really is a killer of range. In cold weather (less than 32F), probably about 10 miles less.
 

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If you're into (safely) drafting a large truck/bus you can dramatically extend your EV miles at high speeds. I got 70KM (43 miles) out of our 2012 that is rated for 55KM (34mi) a few days ago, and that was at around 120KPH/70MPH
 

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Moderate to heavy rain will lower your EV range and also MPG when using gas as the vehicles' tires must push the accumulated water on the road surface out of the way.
 

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If you're into (safely) drafting a large truck/bus you can dramatically extend your EV miles at high speeds. I got 70KM (43 miles) out of our 2012 that is rated for 55KM (34mi) a few days ago, and that was at around 120KPH/70MPH
The best part about drafting a semi with your ACC on is that large rigs do their best to maintain a constant speed, when they do slow down or accelerate they do it gradually, and the they are a big target for the ACC to track. The downside is you can't see much road ahead, and trucks are prone to kicking up pebbles.
 

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Not using ACC, no climate control except fan, 70 mph on 41psi 235 wide performance self-sealing nets about 45 miles with modest (1100') altitude changes.

Rain is highly variable. Anywhere from 5% to 33% drop in range. Winds and standing water often accompany rain. Heater use can drop it further. Luckily, there is a generator available.
 

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My range takes a huge nose dive at 70+

37 mile commute home. At 60mph with rush hour traffic I can do this in mild weather on 8.5 kWh. If I avoid traffic and take the expressway the commute is now 41 miles and I’ll use 11.5-12 kWh. Average speed is the only real thing that changes. Expressway is 70-75 pretty much the whole way (40 mins.) 8.5 kWh route is average 41mph and takes about 50 mins.

It’s a pretty substantial difference.

TJ


Sent from my iPhone using Tapatalk
 

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Most of my commute is at 77-79 mph every day. For those trips I get about 10-15% less then my EPA range (2013 model). This is under typical conditions: no rain, moderate temperatures, no heater use and light A/C. 35% off of the EPA range is about the worst I have ever seen in any conditions.
 

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This might be a good approximation based on my experiences and the posts here. The approximate gen2 highway EV range in good conditions is about:
expected EV miles range = 115-mph
A gen2 Volt at 60-62mph should get near the EPA combined value of 53 miles of EV range, and you lose about 5miles range for every 5mph increase in speed.
 

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I take a long, routine bi-weekly trip where the speed limit is 70. I set ACC to 72, and get 47 EV miles.
 
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