Getting more out of a scented candle

No, this is not an SEO link bait title. It is an honest post on something that has been puzzling me the last few weeks. My wife loves getting scented candles for the restrooms so they always smell nice and fresh. I will admit that I do prefer the scent emanating from the candle to the alternative. So all was nice and good until I looked at one of the receipts from Yankee Candle. I was shocked. The candles we were using we as expensive as $22.50 each. There is an always available offer of buy two, get the third one free or buy one get one 50% off that averages the cost per candle to about $15. Even that is extremely expensive. Considering that it is all going up in smoke anyways, I found it hard to digest that the candle we were using cost that much.An engineering problemUnfortunately, to add to the cost, there is the lack of optimal utilization of wax that plagues most candles. If you use one, you'd have observed that the walls have a good amount of wax left when the wick reaches the bottom resulting in wasted wax. One of the funny things you pick up on the way to an engineering degree and then a career is the hardwired ability and need to optimize every problem- be it at work or at home. So like  a good engineer I set out to solve the candle problem. Was there a way for me to get more out of a candle?. I rolled up my sleeves and went to work.The case of the wax and the wickI started with the most obvious approach. Scrape the sides of the candle so the wax on the walls would fall in and thus get used eventually. This was only partially successful. The reason was that the wax started covering the wick or worse still reducing the height between the wick and the wax thereby making it hard to light up the candle. The wick never caught fire. I trimmed the wick a wee bit to help light up but it wasn't really convenient. As a second approach, I tried pouring out some of the melted wax right after I put out the flame to help with the wick depth, but realized I was wasting valuable wax that would be burnt the next time. Scraping also brought another issue to the fore-soot. So I had to scrape without really scraping all the wax from the walls of the jar.A better jarA wider circumference jar would help with some of the problems but it would only increase the distance between the wick and the walls that wax would certainly be left wasted. A narrower jar would help with reducing the amount of wax on the walls but would  make any form of scraping and optimization a logistic challenge.Finally, the InternetI turned to my trusty old internet for answers and found one article that told me that I could get more out of a candle by burning it for longer stretches of time. Sure. That would be the simplest way for me to buy more candles. That would only exacerbate my situation. Not really solve it. A better search for "get more hours from a candle" brought me to another article that had better tips. The author suggests that I trim the wick (to a scientifically controlled degree) that would result in a smaller flame and thus lesser fuel consumption.So...I don't have a solution yet but I intend digging deeper (literally) until I solve this problem. If any of you an approach that worked for you, do share. I am sure enough and more of us can benefit from it.