I'm not sure if its just me..but last week I discovered the gain **** on my amp. I have a 300w amp at 4ohms hooked up to a 350rms sub. So I turned it up because it was not putting out enuff bass for my tastes. Now I drove around over the weekend, no more than I usually do. And it seems that im eating gas like nothing. Now I dont know if its because its the way im driving, or because I cant hear that im gunning it over my system:P. But would my setup affect my mpg at all?

99 Grand Prix.

 

if you add 500lbs = to 1mpg
if your alt can not keep up to the amps going out then yes you will have a lower mpg

 

Would a stock alternator cause this? Would a cap help?

 

If you are treating the gain **** on your amp as a volume control, you had better be ready to buy a new sub. Time to do some searching and reading on how to PROPERLY set your gain control. A cap for the most part will not do scratch for you. A alternator may or may not be beneficial depending upon the size of the amp(s). Do a search on the big 3 as well.

 

I dont think im using it as a volume control, I just turned it up a bit. My amp is only 300watts at 4ohms. Where can I find a guide to properly change my gain?

Is it just a coincidence that it seems im loosing mpg?

 

more info needed
like my car needs 58v and has a 60v alt and my amps need 30v then yes but if your stocl alt is 140v and the car needs 58 and your amp needs 30 then no

thing to look at how long ago did you do thing like air Filter,gas Filter,fuel injector cleaning ,DISTRIBUTOR cap ,SPARK PLUGS ,oil

 

I have no idea what you just said. What should I check first?

 

go to your car open the air box up remove the air Filter look to see if it is blk with crap


WHAT CAR IS IT ?

 

Its a 99 Grand Prix.

 

what work have you done to the car ?