MPG issue - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

bionick · 01-24-2014, 12:21 PM

Okay so my cars average fuel economy on the highway usually says anywhere from around 28 to 32+ miles to the gallon a
With cruise on and randomly now it only goes to 18-20.
What could cause this? Drive on this freeway all the time and it always says about 30

Mark114 · 01-24-2014, 09:55 PM

Have you changed anything on the car recently? Or switched to different gas?

AKA-22 · 01-24-2014, 10:02 PM

weather will effect MPG

bionick · 01-24-2014, 11:24 PM

Quote:

Originally Posted by Mark114

Have you changed anything on the car recently? Or switched to different gas?

I recently upgraded my stock 18" LT trim wheels to 20x10 wheels with 275/40/20 tires on all corners. Same wheel diameter but wider. Will wider wheels (more tire friction) effect my MPG?

And I know weather effects it but weather hasn't changed much around here lately.

UNRIVALED SS · 01-25-2014, 08:38 PM

Wider wheels with greater friction surface is insignificant overall. However, greater unsprung weight could be the culprit. It can tell you it matters substantially.

3rdgen3 · 01-26-2014, 06:29 PM

2 summers ago I put larger/heavier wheels on the back of my SS and i lost 4 mph of trap speed in the quarter mile!

I also lost ~50-60km's per tank or there about compared to stock tires. When i switched back to stock tires, gained everything back right away.

But eh, you gotta pay to play!

bionick · 02-08-2014, 11:04 PM

Quote:

Originally Posted by 3rdgen3

2 summers ago I put larger/heavier wheels on the back of my SS and i lost 4 mph of trap speed in the quarter mile!

I also lost ~50-60km's per tank or there about compared to stock tires. When i switched back to stock tires, gained everything back right away.

But eh, you gotta pay to play!

Maybe I got a bad tank of gas or something because I did the same drive a couple days later and got much better mileage

supasport · 02-09-2014, 10:43 AM

on a full tank i get 180-220 miles in city
reads 11.5-12mpg

Bagsby · 02-12-2014, 02:35 PM

I do at least 90% city driving and run ethanol free 93 octane. I am averaging around 12.4 mpg. When I got the car it was at 13 mpg. I try to reset my mpg reading everytime I fill up. Could the ethanol free gas be lowering my mileage. I don't dog the car around town but I don't baby it either.

01-24-2014, 12:21 PM	#1
bionick Drives: 2010 2SS/RS M6 Join Date: Oct 2013 Location: Gilbert, AZ Posts: 931 View My Garage	MPG issue Okay so my cars average fuel economy on the highway usually says anywhere from around 28 to 32+ miles to the gallon a With cruise on and randomly now it only goes to 18-20. What could cause this? Drive on this freeway all the time and it always says about 30 __________________ 2010 Camaro 2SS/RS \| 416 LS3 \| FED stage 2 heads

01-24-2014, 10:02 PM	#3
AKA-22 Drives: ELLE-1 Join Date: Jul 2011 Location: Farmington ,mo Posts: 1,175	weather will effect MPG __________________

01-26-2014, 06:29 PM	#6
3rdgen3 10-bolt Destroyer Drives: 2012 Camaro 2SS/RS - AGM, LS3/6M Join Date: Jun 2012 Location: Canukistan Posts: 860	2 summers ago I put larger/heavier wheels on the back of my SS and i lost 4 mph of trap speed in the quarter mile! I also lost ~50-60km's per tank or there about compared to stock tires. When i switched back to stock tires, gained everything back right away. But eh, you gotta pay to play! __________________ 2012 Camaro 2SS/RS - LS3/TR6060: Cam, Headers, Exhaust, Intake, Gears, Twin Disk, Suspension, Tuned - 475rwhp, 443rwtq

02-09-2014, 10:43 AM	#8
supasport Drives: 2010 camaro ss Join Date: Jun 2012 Location: jersey Posts: 468	on a full tank i get 180-220 miles in city reads 11.5-12mpg __________________

01-24-2014, 09:55 PM	#2
Mark114 Drives: 2016 2SS Convertible Join Date: May 2012 Location: St. Louis, MO Posts: 1,711 View My Garage	Have you changed anything on the car recently? Or switched to different gas?

01-25-2014, 08:38 PM	#5
UNRIVALED SS Drives: 2010 Camaro SS Join Date: Aug 2010 Location: El Paso Posts: 704 View My Garage	Wider wheels with greater friction surface is insignificant overall. However, greater unsprung weight could be the culprit. It can tell you it matters substantially.

02-12-2014, 02:35 PM	#9
Bagsby Drives: 2010 Camaro 2SS RS Join Date: Oct 2013 Location: TN Posts: 17	I do at least 90% city driving and run ethanol free 93 octane. I am averaging around 12.4 mpg. When I got the car it was at 13 mpg. I try to reset my mpg reading everytime I fill up. Could the ethanol free gas be lowering my mileage. I don't dog the car around town but I don't baby it either.