Pondering a new car

[94capl99]

But the question still has gone unanswered. I'm not going to buy another car now, but I want to make sure I'm getting exactly what my engine needs.

Regular seems to make it knock a few times when I step on the gas.. Premium doesn't do that. This is why I'm looking at the timing now. Because my timing is probably advanced too much for regular, but I need help adjusting that.

Here's my main spark advance tables.



Gas milage wise, I actually got a little less on regular.. With premium I get 21mpg average.. On the regular I got 19mpg.