We've spent our fair share of time behind the dash of Tesla's gorgeous Model S, though there hasn't been an opportunity to push the all-electric vehicle to its limits on the fuel battery front. The sedan still isn't quite ready for a full-on range test, but the manufacturer has provided a teaser in the form of some updated stats, with a line graph demonstrating consistent improvements over the Roadster. Assuming constant highway travel at speeds of 50-70 miles-per-hour, the Model S is expected to continue rolling for 250-350 miles on a single charge, with the car possibly exceeding 400 miles at slower speeds (think 35 mph and below, but still on the highway). There's an 85 kWh battery on board (compared to 55 kWh on the Roadster), and despite taking a massive hit for size and weight, the Model S only consumes about 10 percent more power than its more-svelte sibling. Those figures apply to the mph listed above, and speed demons can expect to see a massive dive in range. Sounds like we can expect some fiery performance on the road -- just, hopefully not in the garage -- when the sedan begins making its way to customers next month, ahead of the original July ship proposal. Hop on past the break and hit up our source link for some nifty graphs, along with Tesla's findings in full.