Quote:
Originally Posted by Tourigjm
you lost me...
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As said in several other threads, it is difficult to know how much you have saved when you get from n MPG to n+1 MPG. This is why some people are suggesting to use GPM (Gallon Per Mile) as European are using LHK (Liter per Hundred Kilometer).
Real example : one year ago I was at 7.0l/100 (33.6MPG) and I'm now at 5.9l/100 (39.8MPG). I'm driving 39.8-33.6=6.2 more Miles Per Gallon, which is a 18.5% improvement. In this case with my 14.3G tank I drove 14.3*6.2=88.7 more Miles.
But if I want to know how much petrol, CO2, money... I saved, I have to use the other way : I consumed 7.0-5.9=1.1 less Liter per 100kms, which is a 15.7% saving. I just have to multiply by cost of petrol and I know my money saving : 1.1*1.4€/l=1.54€/100kms, ie 0.924€/day (60kms/day).
This sheet can be applied to your modding. If you win 2 MPG from 33 to 35, then you see how much you save per Mile : 0.003314 + 0.003119 = 0.006433$/M. If you drive 40 Miles/day then you save 0.25732$/day. If your mod costs 100$ then it will pay for itself after 100 / 0.25732 = 389 days.
Hope it helps,
Denis.