what is the main cause for a small block chevy v8 to use more gas?

i have put a new cam , lifters, push rods oil rings, new distribitor cap,rotary button , plug wires, and plugs .
along with new head gaskets ,oil pan gaskets,timing chain cover gaskets,valve cover gaskets,intake manifold gaskets water pump gaskets…….
trying to figure out why my small block chevy 267 v8 115 hp using alot of gas put a forth tank in and run it maby 1 mile down to road to see how it run , and it been runing in drive way off and on while working on it and it back on e now from friday to sunday most it been run any ideas on what to check for ? and i dont think i have a fuel leak…..
distribitor is hei timing is set at 6 degrees before top dead center on timing had it around 8 but whe back it down. and the 267 was only made for a few years think between 79 through 82 i think…

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