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Hi,
As far as costs go, I got HUGE returns on a few rolls of tape (say $25-30 worth?) and a $20 sheet of Coroplast. I spent well over $50 on the AirTabs, which was a total waste. I spent ~$120 on the smooth wheel covers. And I can't forget the ScanGauge II at $150 + an extra cable (which I have not used yet). The total is ~$526-ish.
Lately, I have been getting over 100 "extra" miles per tank, which is (at least) 25% more than I used to. So, that is ~$6 savings per tank. I just put in the 200th tank (I'm getting near the end of my 201st!) -- I've owned the car for a little over 4 years, so I save(d) my total cost in ~90 tankfuls.
I also like to think that I'm doing my part to make things better/less bad, in terms of the environment. In those 200 tankfuls (50 per year) -- how many million+ year old plants and animals are there?
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