Hello,
I currently have a civic vx hatch with a d16z6 swap and I have had this swap in the car a couple of years now. I have had it tuned to lean it out a bit and I get about 42 miles per gallon highway and 30+ city. My motor is getting a little old and I would not mind swapping it out for something with a bit more power. I have found two swaps for great prices both with really low miles. One swap is an ls and the other a gsr both obd2. How much of a fuel milaged loss will I be looking at. The only reason I ask is because of this summers gas prices. Oh btw I only use 93 octane.

Thanks

 

Get the LS and use 87.

 

agreed, get a stock ecu or retune for the ls?

thanks

 

how are you guys getting that good of gas milage on them engine swaps. i have a y7 in mine and i only get 32mpg.