2018 Chevy Diesel Pickup.

I bought a 2018 Chevy Diesel pickup in 2018 and I am doing my 2018 taxes right now. I am not sure where to enter this in for the deduction. Because I believe I can use the whole entire amount? Obviously I only get a portion of what I paid but because it is a diesel or something. So, does that mean I answer the questions on an energy efficient vehicles because it is diesel? I just want to make sure I put it in the correct box

Thank YOu.