I just completed my first winter with 19" Bridgestone Blizzak DMV2 winter tires. I set a trip meter on the day I installed them, and below are the results from the day I changed them out this week. This is for my Aug 2016 MX 75D. Regular tires are the OEM 20" Conti-Silent. First, the efficiency numbers before the Blizzaks were installed: 22,920 miles over 16 months which includes one full Colorado winter. Mild temperature average was 292 Wh/mile; cold weather average was 330 Wh/mi; and lifetime average at the time the Blizzaks were installed was 311 Wh/mi. For the Blizzaks: 3279 miles over 3.5 months. Average efficiency for this period was 374 Wh/mi. My lifetime average rose to 323 Wh/mi. There are caveats that make it difficult to determine how much of this efficiency loss is due to the tires. 62% of the miles driven in this period were on a road trip to the upper midwest during the deep freeze. For 2030 miles over 10 days, the car was exposed to a temperature range of -14 deg F to about +12 deg F. Most of the time we saw low single digit temps which made our 75 kWh battery beg for mercy. Additionally, the rest of this Blizzak period was during in an abnormally warm and dry Colorado winter. Diving temperatures in the 40s to 60s (deg F) leads to softer winter tires and increased friction. So I think I've concluded that the Blizzaks did have a negative impact on efficiency but I can't say precisely how much. I do know that trip planning with these tires on requires an efficiency estimate of 350 to 360 Wh/mi in the planner. With all this said, I don't second guess this decision. The performance of these tires in snow is superb.