how to reduce highway noise '93 Civic ?

The noise level is either worse or more bothersome. Probably due to more frequent and longer highway trips.
a sound level meter shows (72-79 db) at ~70mph depending on road surface
Any success stories on reducing noise level ?
undercaotngs sound proofing etc
TIA Robb
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Robb wrote:

See a good tire dealer. bob
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