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Old 20-05-2020   #1
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Fuel Economy

My moms Ď14 500 Pop Automatic Multiair is getting anywhere from 11-23 mpg city and highway. Is there anyway to bring it up, we only drive it hard getting on the freeway. Should she try shifting manually at low revs.
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Old 20-05-2020   #2
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Re: Fuel Economy

Check brakes are not dragging.
Check emergency brake fully disengaged when released.
Make sure tyres correct pressures.
Don't use a.c.
Does she drive a lot of short distances.
How are you measuring mpg?
How many litres per gallon?
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Old 20-05-2020   #3
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Fuel Economy

Quote Originally Posted by jackwhoo View Post
Check brakes are not dragging.

Check emergency brake fully disengaged when released.

Make sure tyres correct pressures.

Don't use a.c.

Does she drive a lot of short distances.

How are you measuring mpg?

How many litres per gallon?


The brakes are fine emergency brakes are off the tire pressure is a little over what the door says to the AC is used on a low setting we drive a combination of short and long distance we are measuring the miles per gallon through the trip computer and it has a 10 1/2 gallon tank. I remember when we used manual shifting car the fuel economy went up by one or two
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Last edited by Rocco Reviews; 20-05-2020 at 22:13.
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Old 20-05-2020   #4
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Re: Fuel Economy

Quote Originally Posted by jackwhoo View Post
Check brakes are not dragging.

Check emergency brake fully disengaged when released.

Make sure tyres correct pressures.

Don't use a.c.

Does she drive a lot of short distances.

How are you measuring mpg?

How many litres per gallon?


What are using auto stick to manual shift to help because I do remember the fuel economy going up by one or two when we shift it manually
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Old 20-05-2020   #5
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Re: Fuel Economy

If you are quoting instantaneous consumption from trip computer that is unreliable.
Next time car filled up , zero the trip ,
Then on following fill up, after say 150 miles divide the trip miles by number of gallons it takes to fill.

That will give an average mpg figure.

Press gas pedal gently , accelerate gently .

Even a.c. on low uses extra fuel.

The computer may have an average mpg read out, have a look in hand book. May be worth resetting average value to zero and starting again if possible.

How did you check brakes don't drag?
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Old 20-05-2020   #6
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Re: Fuel Economy

Have a look at the differnce between and imperial gallon and a usa gallon.
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Old 20-05-2020   #7
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Re: Fuel Economy

I see you have posted elsewhere that car has a very serious oil leak.
You must 100% get that fixed before being concerned about fuel consumption.
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Old 21-05-2020   #8
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Re: Fuel Economy

Quote Originally Posted by jackwhoo View Post
If you are quoting instantaneous consumption from trip computer that is unreliable.

Next time car filled up , zero the trip ,

Then on following fill up, after say 150 miles divide the trip miles by number of gallons it takes to fill.



That will give an average mpg figure.



Press gas pedal gently , accelerate gently .



Even a.c. on low uses extra fuel.



The computer may have an average mpg read out, have a look in hand book. May be worth resetting average value to zero and starting again if possible.



How did you check brakes don't drag?


if we take the car on a long road trip on the freeway we get about 30 miles per gallon highway the car stops perfect we donít hear any noises or squeaks coming from the brakes on a hard braking and when we got our tires changed we werenít told that we needed new brakes
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Old 21-05-2020   #9
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Re: Fuel Economy

Quote Originally Posted by jackwhoo View Post
I see you have posted elsewhere that car has a very serious oil leak.

You must 100% get that fixed before being concerned about fuel consumption.


Donít worry we brought the car to a mechanic itís being looked at now I was just wondering how we can make the mpg better when we get it back because itís been like this for three years. The mechanic said itís probably the vacuum pump.
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Old 21-05-2020   #10
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Re: Fuel Economy

What grade of fuel do you use?



Also you really need to look into what oil grade and spec is in the engine as the wrong stuff can cause plenty's of issues
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Old 21-05-2020   #11
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Quote Originally Posted by Rocco Reviews View Post
Donít worry we brought the car to a mechanic itís being looked at now I was just wondering how we can make the mpg better when we get it back because itís been like this for three years. The mechanic said itís probably the vacuum pump.
Get them to check the brakes do not bind

Regarding your fuel use.. what air temps do you tend to drive in ?
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Old 21-05-2020   #12
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Re: Fuel Economy

Reset the trip (mileage) counter, this in the UK resets the average fuel figure, the fill the car full, perhaps use a premium fuel some US is a low standard around 85 drive the car for a few weeks and see what the figure is?
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Old 21-05-2020   #13
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Quote Originally Posted by Rocco Reviews View Post
if we take the car on a long road trip on the freeway we get about 30 miles per gallon highway the car stops perfect we donít hear any noises or squeaks coming from the brakes on a hard braking and when we got our tires changed we werenít told that we needed new brakes
Is the 30mpg from computer display or calculation from fill up to fill up using miles covered and fuel used?

Is computer display average mpg or instantaneous mpg use?

It is not possible to tell if a brake is dragging by weather the brakes work or not

After a drive put your hand near each wheel , if you feel a lot of heat coming from one wheel more than the others brake may be dragging. Front wheels should be same temp as each other .
Rear wheels should be same temp as each other.
Front wheels should be warmer than rear wheels.

You could ask garage to check no brake dragging when it's with them and they may have it lifted on a ramp.
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Old 21-05-2020   #14
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Quote Originally Posted by jackwhoo View Post
It is not possible to tell if a brake is dragging by weather the brakes work or not

After a drive put your hand near each wheel , if you feel a lot of heat coming from one wheel more than the others brake may be dragging. Front wheels should be same temp as each other .
Rear wheels should be same temp as each other.
Front wheels should be warmer than rear wheels.

You could ask garage to check no brake dragging when it's with them and they may have it lifted on a ramp.
Covered in one of their other threads

Im waiting until tomorrows updates
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Old 21-05-2020   #15
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Quote Originally Posted by John202020 View Post
Reset the trip (mileage) counter, this in the UK resets the average fuel figure, the fill the car full, perhaps use a premium fuel some US is a low standard around 85 drive the car for a few weeks and see what the figure is?
I dont recall them saying what State..
Hence the climate question..

But fuel spec.varies massively stste to state
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