I use Brent's excellent spreadsheet on my iPad. I added two columns to calculate the percent of time on gas vs electric miles, by plugging in the 26mpg hwy - which I confirmed as a typical figure for HWY driving - i use stealth in town, and have only used gas (sport mode) when taking a long trip, involving hwy driving.
By taking the gallons used, and multiplying by 26, I get "gas miles driven"... Which I subtract from total miles driven to get electric miles.
I'd be happy to share the data. With almost 3000 miles, including a few long trips, I am a north of 100 mpg. [hr]
I just tried the govt form. Pretty nice. Though, I had to laugh when it kicked out an error at my gas mileage was too high (too many miles between fill-ups, was the warning message). Yea. That is kind of the point of the car -- to use hardly any oil.
Fisker owners... If you have you gas receipts and mileage readings, add your records.
The EPA figures are totally off base from my driving experience. The EPA says 21 mpg hwy. I systematically measured hwy mpg at a range of set speeds from 55-80 over 113 miles in roughly 3 mile increments with an average of 65 mph, and got 26mpg. So the epa's 21 is not reflective of how the karma is used. On city streets, or when traffic slows to a crawl, that's when a karma owner uses all electric. Next, epa says electric range of 33 miles! The 33 mile range is also not consistent with my experience. I am in the 40s.
Goeltz, In terms of the form, It would be nice to reset the tolerance for a fisker, and to back into the electric vs gas miles used. I hope you get owner participation. More data is good!