I just did some quick calcs, based on driving 15,000 miles per year:
BEFORE: without the cap, at your original "combined" mileage of 16 mpg
- 937.5 gallons = how much gas used to cover that distance
- $2812.50 = cost @ $3.00 / gal.
AFTER: with the aero cap and your improved combined mileage of 17.7 mpg ...
- 847.5 gallons of fuel burned
- $2542.37 = total cost @ $3 / gal.
That's a savings of
90 gallons, or
$270
If all the driving is all highway based, going from 18 to 22 mpg the savings become
151.5 gal., and almost
$455!
Talk about a good ROI. You'd think truck owners would go for that.
Amory Lovins would sure approve.