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Whats everyones mpg's?

32972 Views 67 Replies 30 Participants Last post by  Newbiecruzer
Hey guys! New to chevy and the cruze world, pretty familiar with diesels in general though. I've had a couple mechanical injection vw's and most recently rebuilt a vw 1.9l mechanical injection engine and swapped it into my samurai. This is my first computer controlled direct injection engine and I'm pretty happy with it so far. Its not the exact car I wanted (white, hatch, diesel with mt with brown leather) but its one of the 3 manual diesels available in the province. On Friday I grabbed a 2017 cruze diesel lt with the 6 speed manual. Its the silver ice metallic with black leather interior. Until about month ago I had no idea chevy had a diesel sedan and went with it over vw mainly because of the 0% financing and that vw doesn't have any new tdi's.

So far I love the car, the electronic throttle takes a bit of getting used to and the clutch has a bit of a different feel to it but the power and economy it makes are amazing for what it is. It has way more power and is way quieter then the old mechanical vw's. The one I just built for my samurai has a 4bt turbo and a performance injection pump and its probably making around the same power but its nowhere near as refined. Its loud and shakes like crazy. I'm not too impressed with the transmission, it rides alright but I feel the gearing (mainly 6th) is off and feel like the shift light is constantly blinking at me. I've got just under 1000km on it and I filled up for the first time the other day. I got 850km to 44l which puts it just under 5.2l/100km and means the dash display was right on with its estimate. 5.2l is about 45mpg which is pretty good as I had a decent mix of city and highway driving. I'm just curious what kind of mpg everyone is seeing per tank in the real world? I'm also curious how many km's it takes for the engine to break in and if there would be any noticeable economy increase at that point?

Anyways here's my cruze the first night I got it
Land vehicle Vehicle Car Hatchback Mid-size car

and here is a pic from the dealer
Land vehicle Vehicle Car Sedan Mid-size car


No real plans to modify it much. Maybe upgrade the headlights to HID's, get the dealer to install some fogs, and when the warranty runs out I'll delete all the emissions crap and throw a tune on it. Would love it if someone brings a plug in piggyback ecu to market that wouldn't effect the warranty!
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Discussion Starter · #9 ·
That's crazy John. No way mine can get anywhere near that right now unless its on perfectly flat ground. Im 7/8 through my 2nd tank but it seems my mileage has really taken a dump in the last 100km or so. Went from 5.2l/100km to 6l/100km average with not much change in driving style or conditions. How many miles are on your car?
 

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Discussion Starter · #14 ·
Did it take a while for your engine to brake in before reaching those numbers? My mileage isn't bad by any means but its not really close to what you guys are getting. Sure with cruze control on flat ground I can get them but there's no way I can average that for an entire tank yet. I doubt I'm going to even hit 800km (500 miles) this tank, 800 miles just sounds impossible. Definitely have more stop and go traffic and more spirited driving this tank vs my first but its going to be interesting to see if it gets much better.
 

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Discussion Starter · #16 ·
Yeah that's insane. Do you do mostly highway driving on flat land? Just filled my 2nd tank only got 734km and the dash showed 40mpg. The app I use to track fuel shows it as 37.5mpg but part of that reading is I don't think I fully filled it the first time. Didn't really think about how much diesel foams up when filling. This time I started squeezing the handle really slowly for the last few litres. Is yours manual or automatic? Mines manual and I struggle to hit the shift light as it seems like it's too little rpm for the engine especially if there is any hills involved. The light comes on at like 1700rpm.
 

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Discussion Starter · #19 ·
Yeah I try and ignore it but for some reason whenever it pops up and I catch it out of the bottom of my eye I have a thought "oh crap better shift!". I just find it funny they made all the gears so small. 5th should be as big as 6th and 6th should be like 1500 or 1600rpm at 60mph. Cruzing on the highway at 60 already puts you above the computers shift point.

Must be the fact you're driving all highway. I do roughly 70% highway driving but some of that is in high traffic. I guess my mileage is in line with epa esitmates.
 

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Discussion Starter · #25 ·
my 2015 1.4l 6 speed 1LT from just over 1000 miles trip is at 36.8MPG, put a k&n intake kit on around 300-500 miles ago and it seems to just keep going up as long as im not using the lead foot

how are these guys getting 50+ MPG???

advanced eco tune?

my car is bone stock except for the k&n

EDIT: Whoops clicked on this from one of the main pages didnt notice till now this was in the diesel subsection LOL
I did the same thing due to the fact that several other gassers already chimed in. I'm 50+ without a tune anyways. Just stay off the freeway. Rural highways(55mph) are how I manage 50s that and using torque app. I keep it out of boost and under 75% load. Seems to work well since I lost somewhere between 3-5 mpg going with non LRR replacement tires. 50$ used set of tires 3/4 tread can't go wrong.
Make sure you run it a bit hard every once and a while. Keeping the turbo out of boost all the time will eventually cause the vanes to seize.
 

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Discussion Starter · #26 ·
Just reset the trip meter on my way home from work. Averaged 4l/100k or 59mpg for 36.5km. Would have been closer to 63.5mpg but there was a few decent sized hills especially off the highway to my house. Looks like my mileage is right on its just traffic I guess.
 

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Discussion Starter · #59 ·
def can be removed, taking diesel out of the equation and the car wont run. Sure its a consumable and added cost over a gasoline vehicle but it has nothing to do with the diesels mpg which is what we were discussing. This isn't a gas vs diesel cost comparison thread. If you want to make it that way then diesel is on average 10-20 cents a liter cheaper then gas in my area. That savings alone easily pays for def and then some. You wouldn't subtract mpg's from a gas cars average because of increased fuel costs would you? the 5-10% added cost of fuel is far more substantial then the fraction of a percent of def consumption.
 
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