If you are swapping a b18b with b20. your going form 1.8 liters to 2.0, Is there anything you need to do to change gas milage ro save fuel economy

 

 

You're swapping in a bigger motor and you're concerned about gas mileage? Stick with the b18 you have and if that motor has a problem and that's why you're swapping it out, buy a d15 single cam hf motor with the hf tranny. You'll love the gas mileage on that.

 

i dont really care about my gas milage i just want to know how big of a differnece it is going to be