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STP cleaner results in poor MPG on Accord mk8 2l ivtec automatic

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Honda Accord
Hi folks,
I decided to clean the fuel system with STP complete fuel system cleaner. I thought I'd have good mpg. However, I only managed to get 34 miles on my accord, mk8 2l ivtec automatic, on motorway. I used to have around 45mpg. Has anyone had a similar experience? My mpg was poor on Saab 93 vector sport, too, when I used it a couple of years ago. I take STP results in higher fuel usage. Thanks
 
These things aren’t always what they’re cracked up to be to be honest. Have you looked at any other items that can affect fuel economy? Service work, fuel filter, o2 sensor?
 
Read the error codes, if any. Keep your tank topped up and keep driving, in case it is a temporarily polluted O2 sensor. Change the fuel filter before doing anything mechanical.
 
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