That's an amusing fairy tale you invented, but sadly for MAGA Land that's all it is.
In January of 2014 gas was at a high of $3.39 per gallon. By January of 2015, it had dropped substantially to $2.20. Then by January of 2016 it dropped further to $2.05. Trump wasn't president and hadn't even announced before the price had already fallen significantly.
The price of gas actually climbed the first two years of his presidency and it never hit the low it was in January of 2016 until COVID hit and demand for gas plummeted sending the price below $2.00 a gallon for several months and that had nothing to do with Trump.
So tell me, what did Obama do to make the price of gas drop so much?