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Old 08-29-2018, 03:45 PM   #1
Blazalin
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Default 2001 Saturn L300 - 16 MPG

Hi All,
New to the forums! Im having issues with my mpg... I used to get 180 mpgs on a full tank and just recently replaced the fuel pump as it was leaking alot of gas but now I am only at 230 mpgs for a full tank... Is it possible that my ECTS sensor has failed? I am receiving a coolant light every morning (ONLY morning I drive all day) but the levels are fine and the temperature is never over the middle line but can sometimes reach it. I live in AZ with temperatures at 106 today.

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Old 08-29-2018, 04:34 PM   #2
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Default Re: 2001 Saturn L300 - 16 MPG

180 mpgs on a full tank? Do you mean 180 miles to a tank or 18 mpg (miles per gallon). And now you're getting 230 miles to a tank or 23 mpg? Your descriptions are confusing. What do you consider a full tank (mileage and gallons) as this can vary from one person's definition to another as to what constitutes a full tank. I tend to be specific by using the number of gallons pumped into a tank from the last fill up and using the trip odometer to correlate gallons to mileage driven to arrive at overall miles per gallon.

My L300 varied mpg because of mixed local and highway in my daily commute to and from work, between 16-19 mpg. On highway drives, my best was just shy of 25 mpg with heavy use of cruise control set for 73 mph with or without ac. My mpg values are neither the best nor the worst. On highway drives, I was able to eek out close to 350 miles on a tank. My present mpg is around 14-16 since retirement and mostly local driving.

If you are getting 18mpg, that's great but on what roads? Local stop and go traffic or all highway?

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Old 08-29-2018, 04:56 PM   #3
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Default Re: 2001 Saturn L300 - 16 MPG

The poster says he's getting 16 mpg in the subject line but it seems like he's saying he was getting 180 (mpg?) per fill up and now getting 230 (mpg?) per fill up. Certainly is confusing but I don;t think that is the issue here.

What seems to be the issue is heat and coolant. He says his coolant light comes on and the temp needle nears half way at times.

The poster needs to get the coolant light issue sorted and a clear handle on whether is car is running hotter than it should.

Engine temperature is a critical part of the efficient engine operation these days seeing as the computer controls more or less everything.

That said the numbers he quotes are confusing at best.

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Old 08-29-2018, 09:05 PM   #4
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Default Re: 2001 Saturn L300 - 16 MPG

I agree about fuel mileage confusion.

Blazalin, your low coolant light is probably on the borderline where (dirty?) coolant and float is coated to lower and trigger the coolant light even when coolant level is correct. If coolant replacement hasn't been performed every 5yrs or 150k miles using Dexcool, its long overdue as coolant may develop scum and coat the float and coolant container. A simple test is to add more water to raise level above the max level line/seam. If the light remains off before starting up in the morning, your coolant container needs to be flushed out and/or coolant replaced.

As a general rule of thumb, the L-series engines do not have faulty coolant temperature sensors. You can verify coolant sensor temperatures; a hand held infrared sensor, dial or meat thermometer inserted into the coolant container after the engine warms up or use a reader capable of displaying coolant temps and correlating displayed temps with thermometer readings. Expect a temperature between 190-200F for a normal cooling system (not overheating).

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Old 08-30-2018, 08:32 AM   #5
rfisher
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Default Re: 2001 Saturn L300 - 16 MPG

hi blaze, floridas and dryer- as a student of mpg going back 25 cars since 64, I have noticed that 3 items affect Saturn L mpg. mine is a 4 cyl. L clutch popper which always gets the same mpg 25 town and33 hwy which is what the epa stated on the broadcast sheet. big factor is to keep the tires at 33lbs cold. let it drop to 25 and mpg goes stinko. 2d is the stickshift which has overdrive in 5th. friends and enemies who have the L in automatics do not get this mpg- they get 18- 23. automatics have been notorious for this since olds brought out the hydramatic in 40. 3d is engine not quickly getting up to operating temp. have found cold engine is frequently caused by worn out thermostat where it opens too soon and too wide. seems the spring on the close plug gets weak form the heating and cooling. invite your comments. thanks tons bob fisher

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Old 08-30-2018, 09:04 AM   #6
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Default Re: 2001 Saturn L300 - 16 MPG

Are you asking or telling?

Very confusing thread. Bye.

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Old 08-30-2018, 11:06 AM   #7
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Default Re: 2001 Saturn L300 - 16 MPG

Quote:
Originally Posted by rfisher View Post
friends and enemies who have the L in automatics do not get this mpg- they get 18- 23.
My 2.2 auto gets a steady 25 mpg in town and up to 30mpg at 70 mph on the highway.

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Old 08-30-2018, 11:46 AM   #8
rfisher
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Default Re: 2001 Saturn L300 - 16 MPG

hi floridas and dsaturn- just giving out info from my personal experience with Saturn L mpg. dsat- that's good mpg from an automatic. most I have talked to with the automatic , have a few mpg less in town and hwy . this has been true with most auto trans . seems this is due to the heavier weight of the auto and the slippage inherent in the torque converter. regards bob fisher

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