Nope, the original is on DL (dual layer media or DVD-9) while the blank media you are using is SL (single layer or DVD-5)
The percentage you see is "how much of the original quality is retained" in the compression process. Generally, the higher the number, the better the quality. This is subjective and has been debated, indeed I have said a lot on the matter... :bigsmile:
You can remove extra's that you don't wish to keep such as bonus features, subtitles and audio tracks to increase the amount of space devoted just to the movie.
Would suggest performing a search on the matter, it has been discussed many, many times.