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Re: Gas Mileage [Re: eljefino] #5117924 05/28/19 07:10 AM
Joined: Nov 2008
Posts: 14,880
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supton Offline
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Originally Posted by eljefino
My prius is set up for slower= better. I've pulled some amazing MPG stuck behind a school bus. LOL

We went on a family trip to DC several years, my Tundra pulling a small popup camper. I got great results drafting semis. I tried drafting a Prius and it didn't seem to do much...


2011 Toyota Camry, base, 2.5L/6MT, 196k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 155k, ours
1999 Toyota Camry LE, 2.2L/4AT, 217k, his
Re: Gas Mileage [Re: Al] #5118011 05/28/19 09:03 AM
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Benzadmiral Offline
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As for me, I'm astonished at what the turbo 4-cylinder in the BMW can do. Not only does it have speed aplenty on tap, but tremendous efficiency for a fairly heavy car. I've been seeing anywhere from 25 to 28 mpg depending how much highway I get in during the ~12 days between fillups. Yesterday's 80-mile highway trip (with A/C on, one passenger, speeds from 60-70 to the occasional 80 for passing) brought the average for this period up to 32.5.

None of my previous cars, including the 4-cylinder Benz and the 4-cylinder Buick, could match this. I have to run premium, yes, but the BMW's mileage increase over the Buick's mpg almost washes out the price increase of 93 over 87 if I purchase carefully.


* *
-- Paul W. (The Benzadmiral)
('16 Buick LaCrosse Premium, 3.6L, deep garnet/light neutral)
http://benzadmiral-uncle.blogspot.com/
Re: Gas Mileage [Re: Al] #5118811 05/28/19 11:23 PM
Joined: Aug 2018
Posts: 855
RDY4WAR Offline
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Posts: 855
I've been calculating it lately as gallons consumed per hour of driving.

I drove a 400+ mile stretch with the cruise control set at 60 mph and again at 75 mph, dividing the mileage by how many gallons it took to top off at the other end.

At 60 mph, it showed 21.87 mpg.
At 75 mph, it showed 18.33 mpg.

60 / 21.87 = 2.74 gallons per hour.
75 / 18.33 = 4.09 gallons per hour.

A 49.3% increase in fuel consumed per hour.

At 60 mph, it took 6 hours and 45 minutes.
At 75 mph, it took 5 hours and 24 minutes.

6.75 x 2.74 = 18.49 gallons
5.40 x 4.09 = 22.08 gallons

22.08 - 18.49 = 3.59 gallons

3.59 × $2.50/gal = $8.98

It cost me $8.98 to save 1 hour and 21 minutes on that trip.

60 mph = 1577 rpm
75 mph = 1971 rpm (+25%)

A 25% increase in rpm with a 49.3% increase in fuel consumed per hour. That's a pretty clear indication that the engine is under a lot more load at 75 mph than 60 mph.

Moral of the story. Wind drag sucks.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: Gas Mileage [Re: RDY4WAR] #5118918 05/29/19 05:48 AM
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supton Offline
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Originally Posted by RDY4WAR
It cost me $8.98 to save 1 hour and 21 minutes on that trip.

2.74 GPH is $9.84 per hour cost, while 4.09gph is $14.68 per hour. Or an extra cost of $4.84/hour to save 25% of your time spent. [Technically tires should wear faster, as should the oil and bearings and whatnot--but I suspect their cost pales in comparison to the fuel burn.]

I guess it comes down, what's the value of your time. A few bucks here, a few bucks there could add up to serious money over a year. OTOH on a once in a great while trip it sounds like it cost you $9 give you an extra hour 21 not sitting in a car.


2011 Toyota Camry, base, 2.5L/6MT, 196k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 155k, ours
1999 Toyota Camry LE, 2.2L/4AT, 217k, his
Re: Gas Mileage [Re: RDY4WAR] #5118932 05/29/19 06:25 AM
Joined: Oct 2002
Posts: 38,271
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Quattro Pete Offline
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Originally Posted by RDY4WAR
I've been calculating it lately as gallons consumed per hour of driving.

I drove a 400+ mile stretch with the cruise control set at 60 mph and again at 75 mph, dividing the mileage by how many gallons it took to top off at the other end.

At 60 mph, it showed 21.87 mpg.
At 75 mph, it showed 18.33 mpg.

60 / 21.87 = 2.74 gallons per hour.
75 / 18.33 = 4.09 gallons per hour.

A 49.3% increase in fuel consumed per hour.

At 60 mph, it took 6 hours and 45 minutes.
At 75 mph, it took 5 hours and 24 minutes.

6.75 x 2.74 = 18.49 gallons
5.40 x 4.09 = 22.08 gallons

22.08 - 18.49 = 3.59 gallons

3.59 × $2.50/gal = $8.98

It cost me $8.98 to save 1 hour and 21 minutes on that trip.
The above example works nicely with gallons/100 miles as well.

21.87 mpg = 4.57 gal/100 miles
18.33 mpg = 5.46 gal/100 miles

This means your fuel economy at 75 mph is 19.31% worse than at 60 mph ((5.46-4.57)/4.57), which means that driving that same route at 75 mph will cost you 19.31% more (in terms of total gallons consumed and therefore in dollars as well).

4.57 gal/100 miles over a distance of 405 miles = 18.52 gal; $46.30 total cost
5.46 gal/100 miles over a distance of 405 miles = 22.09 gal; $55.24 total cost



2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Gas Mileage [Re: Al] #5118972 05/29/19 07:20 AM
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gofast182 Offline
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One of the best fuel efficiency stories is our new 2019 BMW X5 40i. This thing weighs 5,000lbs (wow) and is powered by the B58 I6 turbo and driven by the ZF 8AT. We get 24mpg around town, 29mpg on the highway, and I got 14mpg towing a 4,000lb trailer & car. To me it is astonishing that a big heavy SUV like this can return those numbers, plus it's fast when you want it to be!


2006 S2000 - Berlina Black - PU 10w30, PCX-004
2020 M340i xDrive - Portimao Blue - Dlr Fill, 114...898
2019 X5 xDrive 40i - Mineral White - Dlr Fill, 114...898
Re: Gas Mileage [Re: gofast182] #5118977 05/29/19 07:25 AM
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Quattro Pete Offline
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Originally Posted by gofast182
One of the best fuel efficiency stories is our new 2019 BMW X5 40i. This thing weighs 5,000lbs (wow) and is powered by the B58 I6 turbo and driven by the ZF 8AT. We get 24mpg around town, 29mpg on the highway,

That is very impressive. Wife's Q5 weighs less, yet you'll only get about 18 mpg around town.


2002 530i   2015 Q5 3.0T   2018 Charger SRT
Re: Gas Mileage [Re: Al] #5125140 06/04/19 12:56 PM
Joined: May 2012
Posts: 3,410
SubieRubyRoo Offline
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Al, I just tagged another 380 miles of mixed (probably 60% highway) on 12.223 gallons in the Impreza, for a Fuelly-calculated average of 31.1mpg. Amsoil ATM just crossed 2k and no change in level either, so it looks like I'm on for the 10k sample with no drain, and swap to the Microgreen to pit the XG vs MG on PC. Enough acronyms for you? LOL

Re: Gas Mileage [Re: Al] #5125236 06/04/19 03:03 PM
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Skippy722 Offline
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Before we moved, I had a 10 mile commute... babying the car as much as I could I was just hitting 23mpg. I now drive 20 miles mostly highway, and driving a little more normally (okay, spirited at times), and I’m getting 27. Bet I could hit or break 30 if I baby it again grin


2016 Chrysler 300S v6
2018 Dodge Grand Caravan GT

Slight Mopar obsession
Re: Gas Mileage [Re: Al] #5125316 06/04/19 05:41 PM
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MCompact Offline
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Today there was little traffic on my 12 mile commute, and almost every traffic light was green. The result was that the Clubman returned 49.7 mpg(adjusted- as the OBC is 5% optimistic). The drive home was a bit more congested so adjusted mileage for the round trip was 42.0 mpg.
I’ll take it.


Mine:
2014 M235i
2009 Cooper Clubman
1999 Wrangler Sahara
1995 318ti Club Sport

Wife's:
2015 X1 xDrive28i M Sport


Son's
2009 328i

Buy what makes you smile...
Re: Gas Mileage [Re: Al] #5125369 06/04/19 07:10 PM
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CR94 Offline
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Originally Posted by Al
... If you are involved in an accident 22% more energy will be released (at 70) than at 50 resulting in that much more injury/damage.
"This shows that a 1% increase in average speed results in approximately a 2% increase in injury crash frequency, ...
No, 96% more energy would be released at 70 mph. (Because (70/50)^2=1.96) Your other numbers are correct (because 1.01^2 = 1.02, about).


2011 Toyota Prius now at 107K
1981 Mazda GLC (323) retired at 606K
1972 Subaru DL retired at 190K
1954 Chevrolet retired at 121K
Re: Gas Mileage [Re: CR94] #5126395 06/05/19 06:47 PM
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Al Offline OP
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Originally Posted by CR94
Originally Posted by Al
... If you are involved in an accident 22% more energy will be released (at 70) than at 50 resulting in that much more injury/damage.
"This shows that a 1% increase in average speed results in approximately a 2% increase in injury crash frequency, ...
No, 96% more energy would be released at 70 mph. (Because (70/50)^2=1.96) Your other numbers are correct (because 1.01^2 = 1.02, about).

lol..yea you are right what was I thinking cheers probably that CBD


Re: Gas Mileage [Re: Al] #5127733 06/07/19 08:53 AM
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SubieRubyRoo Offline
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Originally Posted by Al
lol..yea you are right what was I thinking cheers probably that CBD THC


Fixed it LOL

Re: Gas Mileage [Re: Smokescreen] #5127738 06/07/19 09:01 AM
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Ws6 Offline
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Originally Posted by Smokescreen
https://ecomodder.com/forum/EM-hypermiling-driving-tips-ecodriving.php

Any vehicle I own gets better than EPA ratings....90% is in technique.


My normal driving nets the same as your results with:


Jeep Grand Cherokee w/HEMI/QD2
370Z
2001 WS.6
1995 Trans Am
2002 G20
2011 Z06

BUT NOT MY 2015 CX5! It couldn't even MATCH EPA highway except on one occasion where I hypermiled the [censored] out of it and [censored] people off.

My 2019 CX5 GTR on the other hand is amazing. Just checked lifetime avg. last night, and it's at 25.6. EPA rating is 22 city, 27 highway. That lifetime of 25.6 includes tons of hooning around, 0-80 blasts, etc. too. Nothing edited. That is the totality of my lifetime of ownership (8200mi so far) of fuel economy, expressed as an average. I can run 87, but choose to run 91 octane for the extra power, and prefer ethanol-free fuel.


2019 CX5 Grand Touring Reserve
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