Improved mpg after Fuel Injection cleaning

5 weeks back I purchased 2012 Prius with 115K miles on it. One owner. He did all maintenance as scheduled at Dealer. In my first 2 weeks, i noticed that the mpg is always 36-39. I compared it with my Prius C for similar trip, same driver me and similar driving habit. My old Prius C (2014) giving close to 49 and this Prius never crossing 39 mpg. I looked at all the maintenance records and schedule Maintenance chart to see what has been done at regular intervals.

I think simple Spark Plugs change or Coils change does not happens till 120K? (I could be wrong).
Fuel Injection cleaning is never a part of Schedule Maintenance.

What i realized in this Prius the pickup was little slow. I mean the response to gas paddle was slow. I also realized that this vehicle is driven 115K miles in USA and I will be driving it in USA for more. I am not sure of Ethanol added fuel is common in other parts of world.

Any way, Scotty KIlmer has a good video on youtube about what kind of Fuel injection cleaner works better in modern Fuels blends and Engines. I used 1 can of Gumot 510011 (PEA based). Poured when tank was half. then added more Fuel to full the tank. Then normal drive.

after 60 odd miles, i notice some mild cranking sounds from engine and some greyeesh (not dark black) smoke from exhaust. It stopped after 10 minutes or so.

After that next trip, mileage improved to 48mpg for the same trip. I also notice that the pickup and speed up is more responsive to gas paddle. Since then i have driven more than 100 miles and my average is above 48mpg now, with avg speed 45mph. This is with normal driving without being cautious of making some Prius Mileage records.

 

Here is a link to video made by Scotty. He gives good reasoning here about how different Fuel injection cleaner are different and why PEA based cleaner should work better in modern cars and fuel blends.

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