This has been figured out before, but I like analyzing the cost to make decisions and think it applies here (just posted in another thread as well):
Regarding whether eTorque is worth adding, based on US numbers, it will take just under 80,000 miles to break even for the extra $1450 cost.
Assumptions: Gas is $3 / gal, eTorque takes you from 17 to 19 mpg combined.
Break even point equation, change assumptions as desired to investigate other use cases:
Initial + driving costs w/o eTorque = Initial + driving costs w/ eTorque
$0+($3/gal * 1 gal/17 mi * z mi) = $1450 + ($3/gal * 1 gal/19 mi * z mi)
Solve for z... z=78,058 miles
As gas gets more expensive (eg $4/gal), if eTorque improves your mileage more (eg 17 to 20 mpg), or if your base mileage is worse (eg 14 to 16 mpg) then this break even point drops lower so the upgrade makes more sense.