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I have a owners manual for a 71 Mercury and it calls for reg gas for 302/351/400 at 91 octane 429 2v and 4v premium at 99.8 octane 1971 octanes were different than today's ?

I treated my tank and installed new sending unit and mine only reads 3/4 to 7/8 when i fill up run for two weeks and it is on empty fill up only takes 9 .5 gallons 16 gallon tank means when on empty i have 6.5 gallons left ? i keep dowel rod in trunk to check levels. marked when full and...