I sometimes think about investing in something for FE, but I decide that it probably won't pay for itself. I don't know that for sure, though. Is there a calculator, or at least a formula, that can help?
I imagine it would require the following data entered: Cost of investment, expected MPG gain, miles driven, and cost of fuel. I could probably figure it out myself but I'm feeling lazy, and why reinvent the wheel?
Better do it on percentages, getting an extra 1mpg on a 50mpg civic has twice the payoff time to getting +1mpg on a 25mpg Mid/full sedan, and 4x the payoff time of getting it on a 12mpg truck.
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
That doesn't tell me if it's worth my money to invest in, for example, aero hubcaps, or a new exhaust, or whatever else. I'd like to feed my data into a calculator and have it tell me how long it would take to pay off the investment, or how much I could invest, or maybe some other ways of looking at it.