Its already been said but a 90mA draw is excessive (.09A). Typically the max draw spec is anything over 50mA is too much and most vehicles dont use more than 30mA. I would be looking for a draw.
Make sure key is off and pulled out of ignition (buzzer), doors closed (dome lamp) , hood shut (hood light) and everything else is turned off. You can start pulling fuses one at a time to try to find the circuit(s) suspect for causing the draw, then unplugging devices fed by the suspect fuse. I usually start with aftermarket accessories or equipment as most of the time its one of these. I cant count all the radios, amps, a/v stuff, power inverters, alarms, remote starts, brake controllers etc causing parasitic draws.
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