2010 Gen 3 Prius Fuel Pressure

If it makes you feel any better, I get about 42mpg on my 2010 in Southern California since day 1

 

In the winter here I get low 40s and in the summer maybe around 45. Depends on how you drive. When I go 85 I only get 39 mpg bit then again any other car wouldn't be getting in the 30s at that speed normally, so I'm happy with it. I think anywhere in the 40s is good. If it was always in the 30s I'd do some checking

SM-G991U ?

 

Our 2010 (Canadian) Touring has the 17" rims, like your V, which impose a mpg penalty.

My current lifetime average is 47 mpg (5.0 liters/100 km). Latest tank is showing 46 mpg (5.1 liters/100 km). Calculated is more'n likely around 43~44. Time of year, trip length, terrain, everything makes a difference.

Screen grab from Fuelly.com, and this is mostly levels with 15" (easier rolling) wheels:



Attached will hopefully help with your fuel pressure check, but yeah, not sure it's worth pursuing:

 

This car doesn't have a sensor to read fuel pressure. Any OBD2 adapter, app, or scantool can only report data sent over the network from a ecu. No fuel pressure sensor, no fuel pressure data.

Besides, if someone who understands how engine controls work could look at fuel trims then they could determine if fuel pressure was causing any problem. I might expect to see fuel trim codes or driveability problems before it affected MPG.

Things that reduce MPG: driving habits, tire choice and inflation, suspension condition and alignment, ICE condition (intake or exhaust restrictions, compression, valve or ignition timing, injector faults) , powertrain function (trans- hybrid drive), body aero , etc.

Posted via the PriusChat mobile app.

 

As mr_guy_mann said, there isn't a built-in fuel pressure sensor, so there's no chance of just asking the car about the pressure. The car can be asked about other things that may suggest whether mixture is or isn't a problem.

If it becomes a matter of reading the fuel pressure, that has to be done by plumbing a pressure gauge into the system. Even at a dealership they'll just unhook the hose at the firewall and MacGyver something up with a tee and fittings. They have part numbers if you want to do the same 'official' MacGyverage that they would.

 

Yeah those 17" porkers take a toll.

 

It's a Prius V... That's slightly better than normal MPG for that car. There's nothing wrong with your fuel pressure, they're rarely a problem in modern cars. If you want to boost MPG further gradually boost your tire pressure up into 40's until you notice slightly less traction on roads you drive most often and then back it off a couple PSI for safety's sake.

 

47 on our Persona w 17 50 series . Pretty much all time wife driving . So stepping on it leaving lights

 

Maybe we better clarify. In 2010 the Prius levels were I through V (Roman numerals), in the States. OP’s avatar says 2010 model year too.

 

Good point... Was going to fast when I made that conclusion.

 

Low to mid 40's is the norm for higher mileage Gen II's. And as already noted, a lot of it depends on the time of year, grade of gasoline, long distance driving versus short and rim size. The Gen 4's really took a leap in mpg.