My daily Cruze Eco MT has been getting shittier mpg than usual. Ideas?
12-20-2017, 01:33 PM
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My daily Cruze Eco MT has been getting shittier mpg than usual. Ideas?
So, I use a Cruze for my commute instead of my SS/TC.
In the past ~6-8 months, I have lost roughly 10mpg average.
2012 Cruze Eco MT 88k miles 85% highway/15% city. I bought the car brand new. I have a 100 mile/day commute. I have also driven the car from New York to San Fransisco, numerous trips from Lincoln back to Detroit, Lincoln to KCMO, Lincoln to Boston, I've been all the way up to Glacier NP, and Lincoln to Orlando a few times.
The car has been around lol.
Never ever had a CEL.
It runs perfectly. Everyone works great. It has truly been an amazingly reliable vehicle.
List of maintenance (I do my own): -always followed the OLMS Down to around 10-5%. Usually get 8000-10000 miles out of an oil change. I check the oil once a month. Never burns, never leaks. -First 30k miles was Mobil 1 5w30 and ACDelco filters. -Next 50k miles was Mobil 1 EP 5w30 with ACDelco filters. -Most recent change was Mobil 1 AFE 0w30 and an ACDelco filters. -One new set of tires. Goodyear Comfortred Touring. (Much nicer than the original fuelmax) -keep tires at 40 psi cold, 45psi cruising @80mph. -dexcool coolant flush @ the five year mark -intake valve and throttle body cleaning at 50k. -MAF sensor cleaning every oil change. -Use Lucas fuel system cleaner at least every 5k. -ACDelco Iridium plugs at 50k, gapped smaller acroding to the GM service bulletin. - 80k attempted to switch trans fluid to Red Line synthetic, but stripped the fill plug and can't seem to find a replacement (FML). -new rotors and pads at 60k after I warped them coming down a mountain in Wyoming. The little hampstee wheel in this thing doesn't engine brake for **** :P. -I only use 91 octane, and I avoid ethanol like the plague (for various mechanical and political reasons). I am forced to get e10 once in awhile and I notice an even bigger drop in mpg.
Now for mods: -Injen true Cold Air Intake that actually goes down into the fender (laugh all you want, I like the sound and I got a good price. Great build quality, by the way. Made in USA too!) -muffler delete ( the turbo and resonator muffle it quite a bit. It's really no louder. I just figured I'd save a few lbs.) -Trifecta custom tune. It has power and eco mode, depending on if you have the cruise control engaged. Obviously, it stays in Eco mode most of the time. But power mode definitely suprises some people.
Ok, so. I use the app acar to track all of my mileage and mpg and all that. My mpg have consistently gone down over the last half a year and I can't figure out why. I've checked over everything that can be cleaned. The oil is good. I just don't know. I used to be getting to 40-48mpg, now it's ~35mpg. My commute is mostly 80mph, btw.
Anybody have anything similar happen. Am I missing something?
In the past ~6-8 months, I have lost roughly 10mpg average.
2012 Cruze Eco MT 88k miles 85% highway/15% city. I bought the car brand new. I have a 100 mile/day commute. I have also driven the car from New York to San Fransisco, numerous trips from Lincoln back to Detroit, Lincoln to KCMO, Lincoln to Boston, I've been all the way up to Glacier NP, and Lincoln to Orlando a few times.
The car has been around lol.
Never ever had a CEL.
It runs perfectly. Everyone works great. It has truly been an amazingly reliable vehicle.
List of maintenance (I do my own): -always followed the OLMS Down to around 10-5%. Usually get 8000-10000 miles out of an oil change. I check the oil once a month. Never burns, never leaks. -First 30k miles was Mobil 1 5w30 and ACDelco filters. -Next 50k miles was Mobil 1 EP 5w30 with ACDelco filters. -Most recent change was Mobil 1 AFE 0w30 and an ACDelco filters. -One new set of tires. Goodyear Comfortred Touring. (Much nicer than the original fuelmax) -keep tires at 40 psi cold, 45psi cruising @80mph. -dexcool coolant flush @ the five year mark -intake valve and throttle body cleaning at 50k. -MAF sensor cleaning every oil change. -Use Lucas fuel system cleaner at least every 5k. -ACDelco Iridium plugs at 50k, gapped smaller acroding to the GM service bulletin. - 80k attempted to switch trans fluid to Red Line synthetic, but stripped the fill plug and can't seem to find a replacement (FML). -new rotors and pads at 60k after I warped them coming down a mountain in Wyoming. The little hampstee wheel in this thing doesn't engine brake for **** :P. -I only use 91 octane, and I avoid ethanol like the plague (for various mechanical and political reasons). I am forced to get e10 once in awhile and I notice an even bigger drop in mpg.
Now for mods: -Injen true Cold Air Intake that actually goes down into the fender (laugh all you want, I like the sound and I got a good price. Great build quality, by the way. Made in USA too!) -muffler delete ( the turbo and resonator muffle it quite a bit. It's really no louder. I just figured I'd save a few lbs.) -Trifecta custom tune. It has power and eco mode, depending on if you have the cruise control engaged. Obviously, it stays in Eco mode most of the time. But power mode definitely suprises some people.
Ok, so. I use the app acar to track all of my mileage and mpg and all that. My mpg have consistently gone down over the last half a year and I can't figure out why. I've checked over everything that can be cleaned. The oil is good. I just don't know. I used to be getting to 40-48mpg, now it's ~35mpg. My commute is mostly 80mph, btw.
Anybody have anything similar happen. Am I missing something?
12-20-2017, 01:42 PM
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12-20-2017, 02:16 PM
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I was also thinking of the 02 sensor. I've never replaced them until they throw a code, so I wasn't sure if it'd be worth replacing just so see if it does anything.
12-20-2017, 03:33 PM
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yeah i dont really know of too much more you could look into. possibly clean the air filter as well. maybe send a log to trifecta to see how the fuel trims are as they might be a little off.
12-22-2017, 08:32 AM
#10
My thought is to get a scanner on this thing. Just a basic bluetooth scanner + Torque app on Android.
Would like to see your Fuel trims. Could have small boost leak or a failing PCV which is common. Lets just hope it's not something major like piston ring failure. I have never seen how rich Trifecta runs the Cruze tunes.
Would like to see your Fuel trims. Could have small boost leak or a failing PCV which is common. Lets just hope it's not something major like piston ring failure. I have never seen how rich Trifecta runs the Cruze tunes.
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