I just finished my b18a1 swap in my 90 hatch and it runs and drives great...but I am not sure if I did something wrong because of the gas mileage I am getting. I had almost a full tank when I did the swap, and I have driven it for 2 days now and I am on empty. I knew my gas mileage would drop some, but this much? Its a stock b18a1 out of a 91 teg, and I think the trans must be a b16 because of the uber short gears. Hell...I am revved to 3600 rpms going 60 mph...so that would probably account for some of the loss, but can someone tell me if this is normal for these motors? I thought my mpg would be somewhere around 23-25, but it seems I am getting closer to 12-15. Any solutions?