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In the small car category, a petrol and diesel sound to be about even. I would do a cost comparison of cost per mile which would take into account the difference in fuel costs.
FWIW, a "peppy" engine encourages a bit more aggressive driving. Assuming you can resist the urge to rev the bolts off of it, you'd likely get better than average economy quite easily.
But with the diesel you can make use of the used chip fat and motor oil by dumping it into the fuel tank after a bit of filtering. Of course, with a mainly full tank I do that with a petrol powered vehicle with no issues.
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 RIP Maxima 1997-2012
Quote:
Originally Posted by jamesqf
I think you missed the point I was trying to make, which is that it's not rational to do either speed or fuel economy mods for economic reasons. You do it as a form of recreation, for the fun and for the challenge.
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