you should make a gallon, what i have heard is those max life shoes last for ever but ive never used them so i cant say 100%. as far as the composites, i run 2 alum,2 comp, and 2 green, and 2 gold springs and my clutch last about 1.5-2 gallons. but going 2 gallons im at the limit, i measure my shoes after every race and i pull them when it measures 23.5 USUALLY, sometimes at 24.

one shoe i wanna try is the kings head, my dad has those in his buggy and truggy and his shoes are like brand new and he has like 1/2 to 3/4 of a gallon on them