does the obd 1 p75 save more gas than the pr4 cuz if so im gona concert to p75 , im spending way to much on gas

 

If you are "wasting gas" on a stock ecu you may want to look into other possible issues other then the ecu.

You need to post exactly what you have i.e. year/make/model vehicle, engine setup etc.

If your check engine light is on, check the codes & also post what codes are being thrown.

 

its for my 98 tegg and i got my car wired to be obd2a and odb 1 its just wen i plug my pr4 in instead of the obd2 p75 i use more gas i was wonderin if i got a p75 obd1 would my car be as fast and still have the fuel efficency

 

Is the car throwing any codes on the obd1 ecu ?

 

no, no codes

 

Use the stock ecu for the stock motor.