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MPG Battle: Lowest/Highest 50 Mile Average

Jack GS

SUPPORTING MEMBER
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Metro Detroit
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2019 Regal GS
I am not sure what came over me, but on one of my recent trips I decided to see just how much fuel mileage I could squeeze out of the GS. I also thought it would be fun to start a thread where we all try to best each other. At the very least, let's see what the GS, Sportback, and TourX are made of.

What's your best/worst 50 mile average MPG?

Rules of the Game
  1. Pics or it didn't happen
  2. Provide driving conditions (average speed, road type, topography, etc.)
  3. Grade and ethanol content of fuel used (87, 91, 93... 0%, 10%, 15%, etc.)
 
Last edited:

Jack GS

SUPPORTING MEMBER
741
861
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Metro Detroit
Buick Ownership
2019 Regal GS
I'm no hypermiler and who knows how accurate our MPG calculators are, but here was my formula for the first attempt:
  • Midwest highway (little to no elevation changes)
  • ACC set to 70 mph
  • Follow distance GAP set to closest setting
  • Drafted a semi truck/trailer averaging 64 mph
  • I had the A/C on (couldn't sacrifice comfort 🤷‍♂️)
  • 87 octane fuel
While I was still behind the semi:
IMG_20190920_184244.jpg

After coasting down the exit ramp and state road off of the highway: IMG_20190920_184903.jpg

Overall trip average. Roughly 80% highway, 15% rural, 5% city. Not bad for a vehicle with a rating of 27 MPG highway... IMG_20190920_185305.jpg
 

CTMechE

Active member
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CT
Buick Ownership
'19 Regal TourX, Essence
Of course, you have this idea *after* I just made an ideal trip on Sat night! Late night 60 mile highway run with little traffic.

I like the idea, but unfortunately I don't often do highway cruises, so around-town will kill any 50 mile average. I tend to be hovering around 26MPG in my TourX all around.
 

Jack GS

SUPPORTING MEMBER
741
861
93
Metro Detroit
Buick Ownership
2019 Regal GS
unfortunately I don't often do highway cruises
Hey, you can still shoot for the worst fuel mileage! I had to think of some way to make the "competition" inclusive to anyone on here in hilly/mountainous areas... or anyone that has a lead foot. Do your best! Or worst??? Lol
______________________________
 

PDXTourX

New member
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3
Buick Ownership
2018 Regal TourX, 2005 Audi TT, 1995 BMW R1100R, 2009 KLR650
Just drove my brand spanking new 2018 TourX 200 miles from the dealership to home. almost all highway: 36.1 mpg. 70 mph except when stuck in stop and go for ~ 10 miles total
 

landsharkmz3

Active member
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For fuel used, please report your ethanol content! That is the important point wrt fuel (octane not so much). The options are typically 0%, 10% or 15%.

I will have to report back later. I have never gone for a specific 50 mile record, but my car is reporting 35.3MPG as a max.
 

Holymoly

New member
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Buick Ownership
Regal TourX
42.4 mpg driving north on I-55 in southern Illinois with a stout quartering tailwind whilst burning 87 octane, assuming 15% ethanol gas.
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Hunter Mike

Well-known member
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America’s Dairyland
Buick Ownership
Dark Moon 19 Buick Opel Vauxhall Insignia Country Tourer Regal TourX Essence Estate Avant Wagon
So far...

Measured mileage is 31.6 over the same distance so the DIC display is ~2% optimistic.


fullsizeoutput_4c5.jpeg
 

Hunter Mike

Well-known member
475
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63
America’s Dairyland
Buick Ownership
Dark Moon 19 Buick Opel Vauxhall Insignia Country Tourer Regal TourX Essence Estate Avant Wagon
New best: 93octane E10 fuel, 75 mile drive 1253ft asl to home 837ft asl.
IMG_1104.jpeg
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Discod

Member
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50
18
Buick Ownership
2019 Regal Sportback Preferred
I feel like we already did this? Mine was 42 MPG, mostly freeway but lots of stop and go, 91 octane fuel, air conditioner cranked high for my menopausal passenger 🤣
 

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D2R

Well-known member
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Michigan
Buick Ownership
2019 Regal TourX Essence
I swear I don't have a lead foot...
I just live so close to work where taking the highway would be longer in both distance and time. So, it is 100% city/suburb driving.
Guess I can shoot for the worst mileage?
IMG_1634.jpeg
 

mike69440

Well-known member
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748
113
Buick Ownership
2018 TourX Essence
12K miles, about 28 mpg lifetime. I drive sort of fast, but avoid using the brakes as much as possible.
 

jclin4

Active member
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Buick Ownership
2019 TourX Essence
12K miles, about 28 mpg lifetime. I drive sort of fast, but avoid using the brakes as much as possible.

I also see 28 avg mpg from day 1 at 9k miles and hate converting momentum to wasted heat energy :)
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Bowstring04

New member
5
4
3
Buick Ownership
Regal TourX
That was set in May 2018 between Grand Canyon North Rim and Kanab, UT averaging approx. 65mph. I am to tell the world my wife was driving at the time.
 
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