Here's a question for all you savvy people out there. A coworker just told me he had a car that required high octane fuel (not a Volvo), but he was able to mess with the timing to be able to put in regular grade fuel. This would help with the knocking, but would it be detrimental to anything else? I'm not trying to race the brick, just get around town. Would this even be worth looking into or would my fuel economy go to crap just for messing with things?
Thanks!!
2000 v70, 98k miles.
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'86 245, 188K
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