figure 3 gal of gas plus 1 hr of time or $7.50 gas and car wear and tear plus $12 to $24 for time. This comes to $19.50 to $31.50 in bonus depending on how much you put as a time value.
Other factors to include other shops on the way or nearby you can grab, value of shop at base rate if it were next store to you is it worth it if not add few bucks in bonus request, money required to put up front for shop, quickness of msc pay.
Shopping Western NY, Northeast and Central PA, and parts of Ohio and West Virginia. Have car will travel anywhere if the monies right.