Let me pose this question...if I gain 1mpg from changing spark plugs (which I did on my daily driver, the old plugs were not "old", I just swapped to a different design)did/do I have to be making more power?
Obviously efficiency went up, but did power HAVE to go up as well?
72 RR, Pump gas 440, 452s, 3800 lbs, Corked, ET Radials,. 11.33@117.72.
Same car, bone stock 346s, 9.5 comp, baby solid. 12.24@110.
