Go Back   Chevy Cruze Forum - Chevrolet Cruze > Chevy Cruze General Information > Chevy Cruze General Discussions

Chevy Cruze General Discussions

Lost 4 mpg. after pan mod


This is a discussion onLost 4 mpg. after pan mod within the Chevy Cruze General Discussions forums, part of the Chevy Cruze General Information category!
I have a 2011 eco manual with 26k. We bought primarily for use on the same hwy trip every two ...

Post your questions that don't fit in other categories here!


Reply
 
LinkBack Thread Tools Display Modes
Old 11-08-2012, 10:25 AM   #1
Junior Member
 
Join Date: Nov 2012
Posts: 2
Default Lost 4 mpg. after pan mod

I have a 2011 eco manual with 26k. We bought primarily for use on the same hwy trip every two weeks. The best mpg was 39 by the guage, which I quickly found was always 3 mpg. higher than p$p actual. This is filling up just before and just after the interstate*.
After the pan mod, the #'s dropped to 35 guage and 32 p&p, 10 miles less than advertised.
My dealer says that the 2013 ecos are comming with the pan cut though I haven't seen proof and doubt Chevy could keep their claimed ratings having destroyed the car's aerodynamics.
All they need to do is put a couple rear facing louvers in the pan right below the heat shield so any oil can escape. Unlike the current remedy, this would preserve aerodynamics and mileage.

Anyone with a '13 Eco- how is your belly pan below the oil spout fixed?


* Tank always holds .7 gal more than dash says was used
howdee is offline   Reply With Quote
Old 11-08-2012, 10:51 AM   #2
Senior Member
 
70AARCUDA's Avatar
 
Join Date: Jul 2011
Location: Tucson, AZ
Posts: 431
Default

Howdy, Howdee! A 4 MPG drop from almost 40 MPG is a 10% loss...that's pretty big for just an aerodynamic loss. I'd suspect tires, gasoline, and weather.

So, what air pressure are you running in the tires? Did your gas station recently switch over from 'summer' gasoline (lower Reid vapor pressure) to 'winter' gasoline? And, how much did the air temperature go down during that time? Temperature can be a DOUBLE whamee: (1) colder air means longer engine warm-up time, which reduces MPG; and colder air (2) causes loss of tire pressures because every 10ºF drop in air temperature results in a 1 psi loss of tire pressure.

Other people have commented that 2013 Cruzes actually are coming from the factory with "hand-cut" engine pan shields (ugh!), but supposedly a new shield is being designed.

Did you know that the exact SAME engine pan shield is used on 2013 Buick Veranos (Cruzes 'twin') but, ironically, THOSE shields have NOT been Safety Recalled!!! Seems the problem is directly related to the 1.8L and 1.4LT engines only.
__________________
2014 Toyota Prius 1.8L (2ZR-FXE) eCVT <--new!
2009 Pontiac Vibe 1.8L (2ZR-FE) 4A
2004 Pontiac Vibe 1.8L (1ZZ-FE) 4A

1971 Dodge Charger 318 3A
1970½ Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula·S 383 4M
1965 Plymouth Barracuda Formula·S 273 4M

Last edited by 70AARCUDA; 11-08-2012 at 10:58 AM.
70AARCUDA is offline   Reply With Quote
Old 02-02-2013, 07:57 PM   #3
Junior Member
 
Join Date: Nov 2012
Posts: 2
Default

Yes 10% drop seems unbelivable but true. Our trips are exactly the same and except for a slight allowance for lugage weight dif. , seasonal temps and blend adj.,our #'s have remained extreamly close. That is until the trip after the pan mod and ever sense.
My dealer went to far as to put my car up on a rack next to what i was told would be a'13 ECO which also had a cut shield. Then he played dumb when i pointed out the other one was an ls 1.8 and with lower mileage ratings than the ECO stick in large part due to it's lack of aero dynanic features such as the ecos grill louver which closes at high speed. That in itself should speak to the aero loss due to engine compartment resistance.
Lets face it, all the ls and lx's top out at 36 MPH,only slightly skinier tires, about 20 lb weight cut and the aero additions give the ECO 42 mpg.
Dont waste 6k on an eco when asimilarly equiped LS with atleast as good mileage.
howdee is offline   Reply With Quote
Old 02-04-2013, 01:06 PM   #4
Senior Member
 
70AARCUDA's Avatar
 
Join Date: Jul 2011
Location: Tucson, AZ
Posts: 431
Default

FWIW, the ECO Cruze has different automatic and manual transmission gearing and final axle ratios than the LS and LT models:



...as well as different Engine Control Module (ECM) calibration via RPO: Y8X - FUEL ECONOMY - ENGINE IMPROVEMENT.
__________________
2014 Toyota Prius 1.8L (2ZR-FXE) eCVT <--new!
2009 Pontiac Vibe 1.8L (2ZR-FE) 4A
2004 Pontiac Vibe 1.8L (1ZZ-FE) 4A

1971 Dodge Charger 318 3A
1970½ Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula·S 383 4M
1965 Plymouth Barracuda Formula·S 273 4M

Last edited by 70AARCUDA; 02-04-2013 at 01:26 PM.
70AARCUDA is offline   Reply With Quote
Reply

Bookmarks



Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 05:15 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0