You will have to decide on what kind of promotion you want to run. The idea of the coupons is that the customer will save some money. I would recommend that you offer a sliding scale discount based on volume. This works on the principle that if one person wants to get his lawn done, he gets 5% off, but if he can influence his neighbor to have his done at the same time, then they both receive 10% off their total bills. If they can organize 4 or more neighbors, THEY ALL WILL RECEIVE 20% OFF THEIR RESPECTIVE BILLS! This means that on a standard starting price of $50 they would all receive $10 off. This also means that you will only receive $40 dollars per lawn BUT YOU WILL MAKE MORE MONEY PER HOUR AS YOUR TRAVELING TIME IS ELIMINATED! I can usually complete about 3 lawns in an hour if they are side by side compared to only 1 and a half when I have to drive, load and unload between jobs. I have doubled my efficiency this way. I have had up to 20 neighbors on the same block agree to have their lawns done all at once.
I believe my fuel expenses were around $3.00 that day (the aerators use hardly any fuel, a 5 gallon gas can usually lasts a few days). So how much profit is involved in that days work? The maximum profit is always in volume business ,SIDE BY SIDE to eliminate driving time.