Audi A5 / S5 / RS5 Coupe & Cabrio (B9) Discussion forum for the B9 Audi A5, S5 and RS5 Coupe and Cabriolet 2018 model year and up

Huge mpg difference between city and highway

 
Old 05-17-2019, 11:21 PM
  #1  
AudiWorld Senior Member
Thread Starter
 
luder888's Avatar
 
Join Date: May 2018
Location: Phoenix, AZ
Posts: 630
Received 5 Likes on 3 Posts
Default Huge mpg difference between city and highway

I've been taking most short trips (< 5 miles) for the past week and I've noticed my mpg averages only about 15 mpg at best. I do drive pretty aggressively but by no mean extreme. I drive in D mode. These are mostly morning trips with a cold engine.

At first, I wondered if my recent alignment was the cause, since I don't remember getting such poor mileage prior to my alignment.

So yesterday I did a test on the freeway, with engine warmed up, cruise set to 70 mph and in a 10 mile stretch I got 37 mpg from point A to point B, and 33 mpg from point B back to A. I reset the trip meter only when I've reached the set cruise speed (so the extra gas to get the car up to speed is excluded) and I measured both ways to account for any changes in elevation or wind speed.

My question is, is that HUGE of a variation in mpg between city driving and highway normal? Is everyone else seeing this?

Last edited by luder888; 05-17-2019 at 11:26 PM.
luder888 is offline  
Old 05-18-2019, 01:38 AM
  #2  
AudiWorld Super User
 
Join Date: Oct 2008
Location: Boston, MA
Posts: 4,220
Likes: 0
Received 0 Likes on 0 Posts
Default

All fuel efficiency ratings goes out the window when you are mKing frequent short trip. The engine is not warm up yet and the Fuel to air ratio is much higher. I sure hope you are not not reving your engine high before your oil is warmed up, that is a big no no.
The G Man is offline  
Old 05-18-2019, 03:42 AM
  #3  
AudiWorld Member
 
RedKloud's Avatar
 
Join Date: Apr 2017
Location: Portland
Posts: 232
Received 0 Likes on 0 Posts
Default

I do mostly suburban driving, no highway, 95% in S mode... getting 16 MPG.
RedKloud is online now  
Old 05-18-2019, 06:27 AM
  #4  
AudiWorld Senior Member
 
JD15's Avatar
 
Join Date: Jul 2010
Location: DFW
Posts: 1,767
Received 7 Likes on 4 Posts
Default

As G Man said, the fuel economy in this car is poor before the engine warms up, so mileage for short trips will suffer. I can get over 21 mpg during pure suburban/city driving (no highway), if the drive is greater than 10 miles, such as for my commute.
JD15 is offline  
Old 05-18-2019, 08:18 AM
  #5  
AudiWorld Senior Member
 
Glisse's Avatar
 
Join Date: Sep 2010
Location: Switzerland
Posts: 1,589
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by luder888 View Post
...

My question is, is that HUGE of a variation in mpg between city driving and highway normal? Is everyone else seeing this?
Yes.
Glisse is offline  
Old 05-18-2019, 08:56 AM
  #6  
AudiWorld Senior Member
Thread Starter
 
luder888's Avatar
 
Join Date: May 2018
Location: Phoenix, AZ
Posts: 630
Received 5 Likes on 3 Posts
Default

Originally Posted by The G Man View Post
I sure hope you are not not reving your engine high before your oil is warmed up, that is a big no no.
No I never do that, I drive immediately and conservatively until at least after the engine oil temperature shows up.
luder888 is offline  
Old 05-18-2019, 09:49 AM
  #7  
AudiWorld Member
 
Join Date: Aug 2011
Location: Putnam County, New York
Posts: 550
Received 0 Likes on 0 Posts
Default

Those numbers under those conditions sound about right for me also. Cold short trip suburban = mid to high teens. Warm short trip suburban = Low to mid 20s. Warm long highway = low to mid 30s.
johncaravello is offline  
Old 05-18-2019, 10:43 AM
  #8  
AudiWorld Senior Member
 
Join Date: Jan 2013
Location: Boston, MA
Posts: 1,089
Received 0 Likes on 0 Posts
Default

Can confirm, I drive in stop and go traffic or city roads 80-85% of the time and my gas mileage is awful.


I don't worry about it, if I cared about the cost of gas I'd be driving a much less expensive car.

The only thing that sucks is the tiny gas tank in this car. I want 300mi per tank, I only get 200. If it was 300 I would be very happy.
ArvX147 is online now  
Old 05-18-2019, 10:43 AM
  #9  
AudiWorld Senior Member
 
Join Date: Jan 2013
Location: Boston, MA
Posts: 1,089
Received 0 Likes on 0 Posts
Default

Can confirm, I drive in stop and go traffic or city roads 80-85% of the time and my gas mileage is awful.


I don't worry about it, if I cared about the cost of gas I'd be driving a much less expensive car.

The only thing that sucks is the tiny gas tank in this car. I want 300mi per tank, I only get 200. If it was 300 I would be very happy.
ArvX147 is online now  
Old 05-18-2019, 11:18 AM
  #10  
AudiWorld Member
 
Join Date: Feb 2009
Location: Canada
Posts: 574
Received 1 Like on 1 Post
Default

Keep your acceleration way, WAY down if you want to get good city mileage. And I mean drive like the most annoying Prius driver.
belzebutt is offline  

Thread Tools
Search this Thread
Quick Reply: Huge mpg difference between city and highway


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: