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I have a little 1.5 amp solar charger mounted in my rear window and i have to say i think it has made a small (positive) difference in my mpg. I reckon around 1 or 2 mpg but its hard to tell. I cant use a scanguage so i am flying blind there. The car starts much quicker though. It was never slow to start but now it fires instantly. I got it cheap so it's doing no harm anyway.
ollie
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