So are you saying your rented L73 hit one from the fairway 40yds and another 50yds, or you came up 40/50yds short of where you expected it to? Or where these hit from the tee into the fairway? Your use of "drove from the fairway" and "fairway drive" are confusing.
If you were in the fairway hitting an approach to the green, which is what I THINK you are describing, you should expect it to go approx. +/- 230 to 250 yds (dependent on wind/elevation/apparel/how far off the Ding you hit/what lie you have/what ball you are playing/how much spin you used/etc...).
If 2 shots went 40 and 50yds total (either off the tee or fairway), you either A) hit the scroll wheel on your PC (or fat-fingered club selection on your tablet/phone) and accidentally selected a wedge, or B) something is wrong with the rental and you should contact CS.
If 2 shots went 40 and 50yds shorter than you expected, you either A) hit the scroll wheel on your PC (or fat-fingered club selection on your tablet/phone) and accidentally selected a different club, or B) your calculations for wind/elevation/spin are WAY off, or C) something is wrong with the rental and you should contact CS.
One last comment, whenever I rent clubs the first thing I do is take them to the "Driving Range" (Kiawah #1 or BPB #10 in low winds) and benchmark them against my current clubs. If they are markedly better in ANY category of distance, accuracy, forgiveness, or meter speed, I usually buy them. If they are not, then I don't.