Gen 4 Prius Fuel Economy

2020 Prius L Eco progress update!

invalid@example.com (Billy56) — Tue, 03 Mar 2026 21:59:56 +0000

...Am still driving about 250 miles per day delivering new cell phones for a large national company. Recently turned 470,000 miles. Still have original brake pads. Car has been perfectly flawless.....no oil burning or leaks, large battery still seems to work as new, no issues.....amazing. Lifetime MPG is down very slightly, to 80.21. I still use Mobil 1, OW-16 and Toyota filter. Always use OEM Bridgestone tires. Buy 3 get one free from the dealer. Last set went 145,000 miles and...

2020 Prius L Eco progress update!

Poor mileage

invalid@example.com (Cathy M) — Tue, 24 Feb 2026 01:11:17 +0000

Hello, my 2022 nightshade mpg had dropped drastically. I serviced the transmission at 55,000 miles and had new tires, Yokohama avid ascend put on and my mpg dropped by over 5 mpg. I was getting 49 to 50 mpg and I am now getting 45 to 46. Side note. My car say adverage of 48 mpg, but when I calculate it based on miles and gallons its 45 to 46 mpg. They are times, like in heavy rain I got 38 mpg and cold mornings , say around 40 degrees, I get 42 mpg. I had it a Toyota twice and they...

Poor mileage

Is this good MPG ?

invalid@example.com (PriusLover2019) — Sat, 21 Feb 2026 18:40:55 +0000

I have Prius 2019 A touring Japan one with 17inch Rim
I drive in Bangladesh heavy Jam and I get 56 MPG combined according to the lifetime run of 53K KMs

BTW, I have ZVW51 chassis

Is this fine?

2017 Prius 3 Touring --70 MPG? I think the car can do it (even if I can't)

invalid@example.com (iraqvet750) — Sun, 25 Jan 2026 20:00:29 +0000

I managed a 66 MPG run over ~15 miles and briefly felt clever, then noticed the eco diary shows the previous owner doing ~60 MPG over 1,500 miles. That was a good reality check. Still learning.

2017 Mpg down to 38 - Any Ideas?

invalid@example.com (robert N) — Thu, 08 Jan 2026 15:55:28 +0000

I have a 2017 Prius 3 or 4 with 90,000 miles. For the last year, I've been getting 36-42 mpg. More than once, the dealer gives me a long list of things to be done as scheduled maintenance for about $3000. I'm always skeptical so I take the list to my regular mechanic. He says, don't bother with any of those except flushing transmission and brakes. Hmmmm?
I just drove my friend's Prius 3 or 4 - 2019 with 60,000 mi. Feels more peppy and he consistently gets 48-55 mpg. Any ideas? Injectors?...

2017 Mpg down to 38 - Any Ideas?

Empty Tank Not Empty?

invalid@example.com (PriusPeep) — Thu, 01 Jan 2026 22:34:21 +0000

My 2017 Prius has a gas tank with an 11.3 gallon capacity, according to Toyota specs.

Multiple times over the years I have waited until I have zero bars on the fuel indicator. I want to learn the single-tank range of my Prius and compare the impact of the weather/temperature.

When I fill up I always get about 9.5 gallons. I have never filled up and reached 10 gallons on the gas pump display.

Does Toyota purposely set the fuel tank gauge to display empty when there are actually...

Empty Tank Not Empty?

My old Prius losses MPG suddenly

invalid@example.com (al espenschied) — Sat, 27 Dec 2025 13:19:35 +0000

I have a 2016 Prius. It has always achieved excellent MPG, averaging 62 mpg over the lifetime of the vehicle which is currently 206,000 - it would be closer to 65 mpg if I had installed the blocks for the radiator from the beginning. I live in Ohio and winter took it's toll on mpg until I found this hack here on PriusChat.

This fall I got new tires, I ordered the same tires as before, which gave me...

My old Prius losses MPG suddenly

Selecting New tires 2018 Prius Two

invalid@example.com (KRDucky) — Sun, 07 Dec 2025 18:30:59 +0000

Good morning all, (night shift here)

So my Prius seems to have a slow leak on all 4 tires since I put them at 36/35 F/R and about a week later they were around 32/30 F/R. Then I filled them to 39/38 F/R and this evening they were around 36/35 but when I got to work they were back at 39/38. Also, the tire temps went from ~84F to 130F over the space of a 40 mi drive in South Texas with the ambient air temp of 84F.

My fuel economy used to be around 52-53 MPG but over the past month or so I...

Selecting New tires 2018 Prius Two

Car mpg lies

invalid@example.com (Buggs1a) — Thu, 06 Nov 2025 02:40:04 +0000

So ok. The car shows over 61 avg mpg for me. That’s a lie I just realized. Toyota should be punished for lying. We rely on that info. It says your ODO. Is that a lie too? How do we know? Mpg is lying. So why not odo too? It says how many miles I’ve gone on my trip meter. Is that lying too?

right now im at half tank. I’ve gone 310 miles so far. Mpg shows 61.x. I forget the x. So this makes sense though. At half tank. 310 miles. But hmm.

I’m confused. But I know the avg mpg isn’t accurate....

Car mpg lies

Optimum Highway Speed

invalid@example.com (Zardoz) — Sun, 14 Sep 2025 02:40:21 +0000

Has anyone determined the maximum Optimum Highway Speed for a Gen 4? I have new Prius 2.

My 05 Prius had a sweet spot of 62 mph indicated.

Thanks!

Major disparity in displayed mpg

invalid@example.com (Jbania) — Sun, 03 Aug 2025 18:30:47 +0000

Hello everyone,

I've been noticing my fuel economy seems to be a lot lower than what it should be. On a recent trip, hand calculations (starting from a half a tank) showed that I used roughly .375 of a tank traveling 184 miles, which is under 44 mpg. My trip display, however, showed an average of 56 mpg (this was a two part trip - the 90 mile second half showed an average of 61.5 mpg on the display). I know there can be a discrepancy between estimated mpg in the car, and real world mpg, but...

Major disparity in displayed mpg

Optimal MPG on Prius Two Eco 2016

invalid@example.com (carlos umana) — Fri, 21 Mar 2025 02:16:07 +0000

Hello pals: my interest is telling to all others owners of the new prius 2016 & 2017 that my experience with my new prius eco 2016 that the MPG its almost fantastic if the person drive according with the car. I got easily 64 MPG without effort! And by the way, I got yesterday october 12/2017 83.1 MPG driving carefully to the limit of the car... In my humble opinion it's really difficult get other car than can be better that Prius in economy and quality, Prius is reliable to the limit. There...

Optimal MPG on Prius Two Eco 2016

Mpg drop after heat exchanger bypass

invalid@example.com (a2058) — Wed, 26 Feb 2025 12:51:41 +0000

I have a 2019 Awde that developped coolant leaks through the heat exchanger so I did the bottom side bypass. I am now seeing consistent 10% loss pretty much, in mpg basically from the day I did the bypass. I guess it makes sense because the engine has to run more to get up to the temperature, etc.

Combined with this, I had a consistent 8% loss in mpg by going from the OEM tires (Ecopia) to Michelin Defender (Costco special) so overall my current mpg is exactly like how my old Gen2 Prius...

Mpg drop after heat exchanger bypass

Toyota Prius 2019 - MPG Drop and Power Issue After Spark Plug Replacement

invalid@example.com (Sohag) — Thu, 26 Dec 2024 23:43:21 +0000

Hi everyone,

I need some advice regarding a problem with my 2019 Toyota Prius (75k miles). Recently, during a full service, I replaced the spark plugs for the first time. Before this, I had done several services but hadn’t changed the spark plugs. My combined MPG used to be around 67, but after changing the spark plugs, it dropped significantly to about 55 MPG.

There’s no error on the dashboard, but I’ve noticed something unusual. When accelerating sharply at speeds of 20-30 mph, the car...

Toyota Prius 2019 - MPG Drop and Power Issue After Spark Plug Replacement

2020 Prime ... EV only = 16 miles

invalid@example.com (Moe_b) — Mon, 28 Oct 2024 06:52:22 +0000

Hello all, I was planning to purchase a 2020 with <50k miles but ended up getting a 2020 Prime XLE with 160k miles! I am the fourth owner but it seems to have been well maintained at the toyota dealers based on carfax.

I fully charged it over night. This morning I drove it on EV only mode and got 16 miles. For the first 5-6 miles I was a bit heavy footed but rest I drove it normal. I have been reading 24 miles EV mode.

Do you think the high mileage may be affecting the battery performance?...

2020 Prime ... EV only = 16 miles

2016 Prius bottom driver tail light

invalid@example.com (Al h) — Thu, 05 Sep 2024 13:57:46 +0000

Hello,
I have a 2016 Prius and the bottom (lower) tail light on the driver side doesn’t turn on. Does anyone know if it’s a bulb replacement or the whole bottom unit needs replacement?

Is MPG inaccurate?

invalid@example.com (Jdpl76) — Thu, 30 May 2024 21:13:12 +0000

I bought my car used and the MPG was around 43 when I got it. I have noticed since I changed my spark plugs and also drive fuel-consciously that my MPG is going up but I never expected to see it this high. I'm guessing it's inaccurate or is 50+ normal for 2016?

MPG dropped by over 20% on the same run and same variables

invalid@example.com (Lichiang) — Sat, 04 May 2024 20:47:13 +0000

Please I don't want to hear about the normal Winter, tyre pressure and etc because it's none of those.

So my MPG dropped by 20% of the exact same journey of all the exact same variables etc. IE Winter, Typre pressure at 36psi new tyres as well, new filter, new 12V battery.

For the last 5 years after a COSTCO fule run I could get home with over 66mpg. Since a few months ago it start to drop and now the best I could get is 46mpg of exact same journey and exact same variables.

No lights on...

MPG dropped by over 20% on the same run and same variables

Sudden drop in mpg

invalid@example.com (momto4girls) — Sat, 04 May 2024 16:08:48 +0000

I have owned a 2016 Prius for a year and a half. I have consistently gotten at least 58 mpg--sometimes as high as 61 mpg. This is a mix of around town and highway driving. The car has 26000 miles on it. I noticed last week that my mpg had dropped to 51. When I filled up the next time, I reset the computer. Now I'm averaging 49 mpg. Nothing about my driving habits has changed. What could be causing this?
Edit to add: I'm going by what the car displays in real time. This isn't a number I came...

Sudden drop in mpg

Fuel economy for short distances

invalid@example.com (VancouverPrius) — Mon, 29 Apr 2024 04:20:54 +0000

I have a 2022 Prius and live in Vancouver. The city is somewhat small and quite dense as a result I usually do not drive more than 5 km at a time (2.7 miles). From time to time I do go on long trips, but that is usually more common in the summer.

If I drive 5KM (including going up a hill and down a hill):

My winter cold start fuel economy is probably about 7 to 8 L/100KM.

My spring cold start fuel economy is about 5 to 6 L/100KM.

Do these figures seem right to you?

Maybe I will report...

Fuel economy for short distances