Another Powerboost horrible mileage thread 12mpg

[Stealthytt]

I know it's another one, sorry in advanced.


I've had my Powerboost (all stock) for about 3000 miles now, this last tank I set out to see what I could get in eco mode only, with city driving. All driving was my normal day to day trips, remote start was used for at least 3 mornings per week for the 30 days on this tank, roughly 5 mins for those days. I did not floor it or drive aggressively also.

I did 146 total miles before filling up (going out of town)

Out of the 147 total miles 69 of them were electric only miles. 78 miles with the ICE. This last fill up I put in 11.43 gallons of fuel for a hand calculated 12.8mpg. The truck calculated 17.6mpg was way off, with the amount of electric only miles I figured I would have had some good results, this is just disappointing. When I think that I have only gone 78 miles on a gas engine using 11 gallons of fuel, it just disappoints me even more lol.

Anyone else on the same boat? I have not taken it in, and not sure if they can do anything if I did.

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[Brute150]

Hey Stealthy,
11 to 12 mpg sounds like towing gas mileage, were you towing something? If not, i would recommend checking your tire pressure, quality of gas(try changing gas station) or just get the vehicle checked.
To give you some idea, i have been regularly tracking all my fill ups (hand calculating gas mileage for about 6300mi so far) and my numbers are 17.7, 18.2, 20.1 , 19.2, 21.8, 20.7, 21.7, 20.4, 20.6. My driving is about 50% city and 50% highway. The trip computer is pretty close to the hand calculated numbers, so far. All stock powerboost 4x4 fx4, 18s. Regular pump gas.
I also drive about 75 on the hwy, so i understand why my gas mileage is lower than advertised.

11 to 12mpg seems super low for a stock powerboost.

 

[tbinmd]

Did you fully fill the tank at the last fill up? If not that would throw off your numbers by a lot. It sounds like you might have had a pump that click off way before the tank was full.

 

[DSpyV]

Did you fully fill the tank at the last fill up? If not that would throw off your numbers by a lot. It sounds like you might have had a pump that click off way before the tank was full.

This is one of the biggest issues with hand calculations… different pumps stop at different times, and if your not putting in the exact amount, number WILL be off.

Potential user error+variance in pump shut off=inaccuracy

 

[Stealthytt]

This is one of the biggest issues with hand calculations… different pumps stop at different times, and if your not putting in the exact amount, number WILL be off.

Potential user error+variance in pump shut off=inaccuracy

Hey Dspyv, thanks for the response

I pumped at Chevron, at the same pump both times, I pump to the 1st click both times.

I agree the numbers would be off, but at the same time I highly doubt my method is gallons apart from eachother.

 

[Stealthytt]

Did you fully fill the tank at the last fill up? If not that would throw off your numbers by a lot. It sounds like you might have had a pump that click off way before the tank was full.

Hey Tbinmd,

Fully tanked to the 1st click both times same station same pump.

Edit: gauge showed full, I have no reason to believe it was not, but I doubt that the margin for the fuel gauge is off by that much to make such a big impact to my mpg

 

[Stealthytt]

Hey Stealthy,
11 to 12 mpg sounds like towing gas mileage, were you towing something? If not, i would recommend checking your tire pressure, quality of gas(try changing gas station) or just get the vehicle checked.
To give you some idea, i have been regularly tracking all my fill ups (hand calculating has mileage for about 6300mi so far) and my numbers are 17.7, 18.2, 20.1 , 19.2, 21.8, 20.7, 21.7, 20.4, 20.6. My driving is about 50% city and 50% highway. The trip computer is pretty close to the hand calculated numbers, so far. All stock powerboost 4x4 fx4, 18s. Regular pump gas.
I also drive about 75 on the hwy, so i understand why my gas mileage is lower than advertised.

11 to 12mpg seems super low for a stock powerboost.

Hey Brute150, I was not towing, and tire pressure should be good, 36psi (tpms) which is what it had when I got it, they were topped off a month ago when I had a nail in a tire.

 

[Jer1983]

The only way to do it is drive down to a certain point on the gauge and then add x number of gallons. So if from fill to click is off you will notice, get an average

 

[DBL R]

My tires have a max psi of 45. The tire shop set them to 35 when I first got them. I increased the pressure to 40 cold with no reduction in ride quality but it improved my mpg by 2. I have the CCD suspension so not sure if that helps smooth out he ride. The psi may not vastly increase fuel economy but could help.

 

[ColoradoHunter]

146 miles in 30 days tells me you are taking very short trips. If so, the engine is never getting to normal operating temps so you get very poor mileage.

 

[Stealthytt]

146 miles in 30 days tells me you are taking very short trips. If so, the engine is never getting to normal operating temps so you get very poor mileage.

My trips are anywhere from 2 miles to 6 miles, I do almost half of each trip in electric. I also usually remote start the truck and let it run for 5 minutes before I get into it.

 

[Stealthytt]

My tires have a max psi of 45. The tire shop set them to 35 when I first got them. I increased the pressure to 40 cold with no reduction in ride quality but it improved my mpg by 2. I have the CCD suspension so not sure if that helps smooth out he ride. The psi may not vastly increase fuel economy but could help.

I will take a look and raise it up a tad and see what it does for me.

 

[gtotco]

My trips are anywhere from 2 miles to 6 miles, I do almost half of each trip in electric. I also usually remote start the truck and let it run for 5 minutes before I get into it.

That might be a lot of it. It’s burning gas sitting still for about as long as your are driving. You probably wouldn’t be doing all that much better in a civic.

 

[tbinmd]

My trips are anywhere from 2 miles to 6 miles, I do almost half of each trip in electric. I also usually remote start the truck and let it run for 5 minutes before I get into it.

The idling will kill the mpg. You need to look at the engine hours.

 

[MJ Heat]

“My trips are anywhere from 2 miles to 6 miles, I do almost half of each trip in electric. I also usually remote start the truck and let it run for 5 minutes before I get into it.”

This is your issue. Crank it when you get in it & take a long 50 mile plus road trip with an engine that has actually warmed up, & then report your fuel mileage. This engine gives its best efficiency after it has warmed up by traveling a few miles. Otherwise, learn to live with what got. It is what it is.

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