CheapFuneral
New member
But the autos so better in the 1/4 
**** you auto correct!
**** you auto correct!
Official: What are your real world MPG Numbers
- Thread starter Sonic-Mike
- Start date
joe truck driver
New member
just saying
worked at it..... at 90 degrees ...had windows up and no air, just the fan on full. I think I remembered close to 700 on that tank. I was filling the filler tube up....had to be careful with that. that is not the best example, but..... your automatic trans won't let you shift low enough...and when you take off, your losing mileage because the torque converter isn't locking up till later. 1.4 turbo stick is the way to go for mileage ,even better in a Cruze . forget the diesel, price of fuel is too expensive.( diesels lose on a cost benefit with price of fuel).
worked at it..... at 90 degrees ...had windows up and no air, just the fan on full. I think I remembered close to 700 on that tank. I was filling the filler tube up....had to be careful with that. that is not the best example, but..... your automatic trans won't let you shift low enough...and when you take off, your losing mileage because the torque converter isn't locking up till later. 1.4 turbo stick is the way to go for mileage ,even better in a Cruze . forget the diesel, price of fuel is too expensive.( diesels lose on a cost benefit with price of fuel).
CheapFuneral
New member
I'd say they currently lost on cost of fuel but in 6 months gas will be back up with diesel.
Where diesel loses is usually maintenance costs. Not as sure about the cars but the trucks have to do things like fuel filters every 15k
**** you auto correct!
Where diesel loses is usually maintenance costs. Not as sure about the cars but the trucks have to do things like fuel filters every 15k
**** you auto correct!
MidnightClub3
New member
Always 31.2 or 31.3... I'm starting to think somethings wrong with the reading because it never changes.
CheapFuneral
New member
Do u ever reset it? It's an average so the more u drive the less it changes. If u change driving styles but don't reset the dic you won't know if your driving style is better unless u do it by hand or with fuelly or something.
**** you auto correct!
**** you auto correct!
The Champ
New member
A year ago - the national average price for diesel was $3.989 and regular gas was $3.457.
Today the national average is $2.864 vs $2.457.
Diesel has sold at a premium for a long time. And will continue to do so for the foreseeable future. This is because of the government mandate for ultra low sulphur content on diesel.
Diesel maintenance costs are steep. I have fleets that I sell parts to that are currently switching from diesel to gas because of the horrendous maintenance costs of the diesel.
CheapFuneral
New member
No doubt that diesel always costs more than regular. But diesel will get you better performance and gas mileage. If you run premium like a lot of us turbo owners, the price difference is minimal no?
Also the Cruze diesel was available in manual I think u would see much higher gas mileage numbers like we do in the manual sonics.
**** you auto correct!
The Champ
New member
I have a 1.4Turbo and run regular unleaded. Have not been able to see any significant increase in performance or fuel economy when trying premium to justify the extra cost.
Not only is the fuel cost and maintenance cost higher, but the buy in to get the diesel engine is also quite a bit higher. About $2500 more for the diesel Cruze compared to a similarly equipped 1.4Turbo Cruze. If you don't want leather interior that is standard on the diesel - the difference between the diesel and the turbo is over $4000.
It would be much less expensive to do a tune on the 1.4 to improve the performance than buy a diesel.
Not only is the fuel cost and maintenance cost higher, but the buy in to get the diesel engine is also quite a bit higher. About $2500 more for the diesel Cruze compared to a similarly equipped 1.4Turbo Cruze. If you don't want leather interior that is standard on the diesel - the difference between the diesel and the turbo is over $4000.
It would be much less expensive to do a tune on the 1.4 to improve the performance than buy a diesel.
ChicksHateMe
Member
Same here. I tried 93 Octane for a few tanks and saw no increase at all. Really thought I would too. Sometimes 1 or 2 MPG's higher, or lower, to go along with different overall tank/trips, but nothing noticeable.
MidnightClub3
New member
The benefits of running higher octane go beyond mpg. It's all-around healthier for the engine and allows the pistons to reach full travel before descending back down to "grab" more air. If the mixture ignites too early you interrupt the cycle prematurely and get loss of power. I'm sure this affects longevity of the life of the engine as well... or sounds like it would at least. Do the 1.8 and 1.4t come with different owners manuals? Mine says recommended 87 octane but I still run 93 and even 94 if they have it. Car responds well to it.
Stew
Sedans Rule!
Well sort of... With higher octane fuel the car can run more ignition timing advance, lower octane often means less advance.
The amount of time it takes the air/fuel mixture to burn is more or less constant but the amount of time it has to burn varies greatly with the engine RPM which is why you can run more advance as the RPM's increase. When the spark plug ignites the a/f mixture it takes a little time for the burning mixture to reach it's peak pressure and the goal is to time this peak as close to TDC as you can.
With less timing advance the starting point of the a/f mixture burn is later in the power stroke (retarded timing) and this peak develops when the piston is already well on it's downward stroke and you do not get the full potential of power.
By having the spark occur while the piston is still on it's way up during the compression stroke (advanced timing) you can time the peak pressure to occur right as the piston is beginning it's downward stroke and wring out the full potential of the burn.
By running too much advance you get ping which is very bad because the piston is still travelling up as the peak pressure develops and it tries to hammer the piston back down. There is also pinging due to multiple flame fronts colliding due to things like hot spots in the combustion chamber igniting the a/f mixture separately from the spark plug.
Last edited:
The Champ
New member
If you believe that, and want to pay more for your gas, it's your car.
But, this info is from the Federal Trade Commision...
https://www.consumer.ftc.gov/articles/0210-paying-premium-high-octane-gasoline
More important than using premium fuel is to use a Top Tier designated fuel - which is recommended in your owners manual.
CheapFuneral
New member
Never said but in was cheaper either but purely based on fuel efficiency the diesel still wins. A 1.4 tuned for fuel economy gets about the same as a stock diesel. If u tune the diesel u can throw that argument out the window.
Personally I prefer diesel (which I'm sure you realize by now) but I'm not saying over all costs are worth it which is what I stated to begin with...
**** you auto correct!
MidnightClub3
New member
Seems there's some grey area on running higher octane on this forum, which is where I may have been misled in the first place. Is there anything special about the Ecotec engine that would allow us to take advantage of higher octane? I know I've heard other members mention it, but I can't remember exactly what was said.
(I'm running 93 because I've re-tuned to it. If I was on stock tune I'd probably be convinced by the link you posted and revert back to 87, Champ.)
(I'm running 93 because I've re-tuned to it. If I was on stock tune I'd probably be convinced by the link you posted and revert back to 87, Champ.)
...and that is the truth.Any mechanic knows that.
carsNskis
New member
40 miles with very little traffic, max speed 67mph with cruise control engaged for 3/4 of the trip. I was sitting at 40.9 until i stopped at Taco Bell... 39.0 as I shut it down
Stock 2014 RS manual on 91 oct Colorado
UPDATE: 80 miles back and forth to work in typical traffic without paying attention to speed or take offs. Played with a GTI on the highway on the way home. Right at 36.0 pulling into the driveway
Stock 2014 RS manual on 91 oct Colorado
UPDATE: 80 miles back and forth to work in typical traffic without paying attention to speed or take offs. Played with a GTI on the highway on the way home. Right at 36.0 pulling into the driveway
Last edited:
SuperFudd
Member
For what it is worth:
The other day I drove ~10 miles on I-880 Milpitas to Union City CA at a steady 55mph and got 55 mpg per the DIC. (see below).
First I got up to 55 mph and reset the DIC. It read 55 as I entered the off ramp. It started out at 55 mpg and I had to fight like hell to keep it there. I think it peaked at 57 mpg. the highway is level and there was no wind.
The other day I drove ~10 miles on I-880 Milpitas to Union City CA at a steady 55mph and got 55 mpg per the DIC. (see below).
First I got up to 55 mph and reset the DIC. It read 55 as I entered the off ramp. It started out at 55 mpg and I had to fight like hell to keep it there. I think it peaked at 57 mpg. the highway is level and there was no wind.
ChicksHateMe
Member
Was just saying elsewhere, it's my 2nd spring with my 2013 and since it's warmed up and she now has 6000+ miles on her (breaking in?), I think I'm really noticing the affect both those factors have in my MPG's. I use the same gas 90% of the fill-ups (Shell 87) and the only other change than the weather and mileage is I switched oil to Mobil One.
I floored it for a while on the highway to see what she'd do, so I ate up some of the good numbers, but on average, higher MPG numbers are there for the same trips I was taking all winter.
Pretty sure over my next few tanks I'll see a nice climb in my MPG's as compared to last year. Hoping anyway.
I floored it for a while on the highway to see what she'd do, so I ate up some of the good numbers, but on average, higher MPG numbers are there for the same trips I was taking all winter.
Pretty sure over my next few tanks I'll see a nice climb in my MPG's as compared to last year. Hoping anyway.
CheapFuneral
New member
I noticed at 5k when I also switched to Mobil one. Not sure if it was break in or the oil because I've been using Mobil one since.
**** you auto correct!
ChicksHateMe
Member
Maybe it's just in my head, but it does all of a sudden feel different, better...
SO far, my record high average for a complete tank is 33MPG. I hope to blow that away SOON. Heater and AC are off and no need to remote start anymore, so those should all help me out.
I also keep getting the urge to check the gaps on my plugs. It runs smooth, but I just want to see that they're where they should be.
I think the only things left for me to squeeze out better numbers are maybe some LRR Tires and taking some lead out of my foot. But that fresh Spring air makes me want to push down hard on that damn pedal to the right.
