Bumping with engine off

General info- I have an 05 Escape with an Alpine MRP-M500 powering a Type R 12. Planning on getting a MRP-F300 for 4 Infinity Reference 6x8s. JVC H.U.

Sometimes I just sit in my car and listen to music. About how long would doing so with the sub pumping 250ish watts drain the battery? I just wanna know whether I should idle the engine, or leave the car off to save gas, if I'm gonna be listening for 2+ hours.

 
General info- I have an 05 Escape with an Alpine MRP-M500 powering a Type R 12. Planning on getting a MRP-F300 for 4 Infinity Reference 6x8s. JVC H.U.
Sometimes I just sit in my car and listen to music. About how long would doing so with the sub pumping 250ish watts drain the battery? I just wanna know whether I should idle the engine, or leave the car off to save gas, if I'm gonna be listening for 2+ hours.
Are you touching yourself or something?

 
General info- I have an 05 Escape with an Alpine MRP-M500 powering a Type R 12. Planning on getting a MRP-F300 for 4 Infinity Reference 6x8s. JVC H.U.
Sometimes I just sit in my car and listen to music. About how long would doing so with the sub pumping 250ish watts drain the battery? I just wanna know whether I should idle the engine, or leave the car off to save gas, if I'm gonna be listening for 2+ hours.
86 min. 31.4 sec.

 
you're sense of humor can go fuck itself....
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