I previously had this really negatively affect my wallet a month ago when I was returning a rental car to the airport. I deliberately waited to fill up until right before I got to the rental car return at the airport. By way of context, the average price here is between $2.80 and $2.90 depending on which part of the city you are in. As you may or may not know, if you bring a rental car back and the tank is not full, they charge you a ludicrous price that is typically more than double the going rate for gas wherever you are. In this case, it was $6.00.
In any event, every single gas station within half a mile of the airport was selling gas for $3.99 a gallon and up. So, by not filling up two exits before the airport, I cost myself more than $1.00 per gallon. I of course had no way of knowing this, but it was a lesson to me to not wait until the last minute to fill up because there is nothing I hate more than having to pay more money than absolutely necessary for something.
So what did I learn from this experience? I am going to start keeping my eyes peeled for a good price around the time my tank hits halfway empty so I am not stuck stopping anywhere with a pump just because I am about to run out of gas.
You may think it's a waste of time and energy to worry about saving such a small amount but I would point out that it can add up. Let's say that each of my wife and I need to fill up once a week. I have a little car with a small tank but she has an SUV with a 25 gallon tank so we are looking at $6.00 per month or $96 annually for me and then $4.00 weekly, $16 monthly and $192 annually for her for a combined total of $288 for the two of us.
I know that doesn't wow you as a huge amount that will change your life, but that is still more than $20 per month to spend or save as you wish.
After that math, I am going to stop the next time I see a station with a cheap price.
Do you research ahead of time where the cheapest gas around you is? Do you recommend any particular apps or websites that you find to be particularly helpful?