by "Noah - Now with more boost." (antriebverliebt)
Published 12/12/2017 at 10:33
by "Noah - Now with more boost." (antriebverliebt)
Published 12/12/2017 at 10:33
Tags: FoodforThought
STARS: 1
The EJ is a dinosaur but that’s part of its appeal. At around 18 MPG average it’s barely more efficient than the 4200 LB, 4.1 liter V8 powered car I used to drive. The interesting piece is that both motors make 265 horsepower, but in different ways. The 900 LB difference and the engine design are the variables. Gearing too. If the STI didn’t exist the WRX would surely have a 6th gear, but since it doesn’t you’re doing 3k RPM on the highway, bare minimum.
We hear a lot about power density in terms of horsepower per liter, but what about some kind of engine displacement vs. MPG comparison? Just for fun really, its not like you could factor in gearing, weight, or what the engine was designed to do, though those are definitely worth noting. I propose just dividing combined MPG by displacement: 18/2.5 = 7.2
What would that 7.2 mean though? I guess you could conceptualize it as the amount in MPG each liter of your engine is contributing to your overall MPG rating. For example, a new GTI gets 30 combined, so each liter of its 2.0 turbo motor is contributing 15 MPG to the overall rating. Conversely, If you’re getting 7 MPG from a 7 liter big block, that’s a 1. So it looks like the range of numbers would be from 5 - 20ish.
"cmill189 - sans Volvo" (cmill189)
12/12/2017 at 12:30, STARS: 1
Bad. I’m not sure what my combined is now. I recently installed run-flat snow tires and my last tank of city driving was just under 15.
15/2.5=6
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 12:31, STARS: 0
Yep. I’m impressed that someone beat my 2.5 actually. That I5 sound though!
"My bird IS the word" (mybirdistheword)
12/12/2017 at 12:35, STARS: 0
10mpga/6.6l=1.51
24.7mpg/1.6t=15.43
"Outlander Engine's Dimensional Emporium" (oengine)
12/12/2017 at 12:41, STARS: 2
k2500 suburban
10 mpg / 7.4L = 1.351351351...
hmmmmm
"You can tell a Finn but you can't tell him much" (youcantellafinn)
12/12/2017 at 12:58, STARS: 0
19.4/2.5t=7.76
21.7/2.3t=9.43
15.5/3.5tt=4.43
"cmill189 - sans Volvo" (cmill189)
12/12/2017 at 13:03, STARS: 1
Yeah, the city mileage is pretty atrocious. Likely due to getting 4,000 pounds moving. Highway mileage is surprisingly good. I usually get 25 or better.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
12/12/2017 at 13:07, STARS: 1
35.6/2.0=17.8.
I do a lot of highway miles though.
"bhtooefr" (bhtooefr)
12/12/2017 at 13:36, STARS: 1
52 / 1.8 = 28.9
However, that’s an awkward measurement, simply because it gets really ugly, really fast, on the extremes. So, I’ll use gallons per 100 miles per liter instead (To calculate that, just do 100 / MPG.)
1.92 / 1.8 = 1.07.
I feel like that formula works better overall.
For instance, with a Corvette, it’s rated at 5.3 gal/100 mi, has a 6.2 liter engine, for a score of .854, meaning that on specific efficiency, a Corvette actually beats my Prius. (Of course, specific efficiency is not actually useful, but...)
"dtg11 - is probably on an adventure with Clifford" (dtg11)
12/12/2017 at 13:36, STARS: 1
24 mpg/2.4L= 10
not great, but a 6th gear would definitely help
"TahoeSTi" (tahoesti)
12/12/2017 at 14:06, STARS: 1
New WRXs have a 6th gear.
You can play with tuning the AVCS advance and timing in the 2000-3000rpm range while your MAF is under 1/gs. People have gotten legacy GTs with an EJ255 to 30mpg highway and 19-22mph city. Also around town, alot of the lost on short trips is just warming up the cats....not much to do about that.
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 14:53, STARS: 0
Yeah the units are a pain, its too bad we don’t use liters
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 14:59, STARS: 0
Yeah mpgs are definitely not a concern just funny given the motor size
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 15:00, STARS: 0
Better than mine!
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 15:00, STARS: 0
Wow that’s really impressive highway miles or not.
"citrus" (roamin)
12/12/2017 at 15:21, STARS: 1
17 mpg/6.0 liters: 2.83
Hmm that’s not good, how bout the other car?
18 mpg/ 5.7 liters: 3.15
Maybe I shouldn’t drive like an asshole all the time...
"Distraxi's idea of perfection is a Jagroen" (distraxi)
12/12/2017 at 15:52, STARS: 1
Toyota GT86: small, light, slippery, and the stock tires are low-resistance types. And even though people diss the engine,the trick dual mode injection system is pretty darn efficient as well as delivering 100 NA hp/litre. It’s actually a much better commuter than I’d expected.
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 16:13, STARS: 0
lol!! yeah that’s not so great
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 16:14, STARS: 0
ahh thats right. the prius tires!
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 16:15, STARS: 0
Life is to short to drive like a normal person.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
12/12/2017 at 16:24, STARS: 1
Yup. Sucky if you’re chasing lap times, good if you’re chasing slidey fun. Economy just comes as a bonus. They last for ever, too: mine have got 35k miles and about a dozen track days on them and they’ve still got some life left.
"Logansteno: Bought a VW?" (logansteno)
12/12/2017 at 17:09, STARS: 1
15.7/5.3=2.96
Odd calculations aside, I’m constantly shocked that brick of a truck I romp on all the time gets over 15 mpg when I drive essentially all city.
"Captain of the Enterprise" (justanotherdayinparadise)
12/12/2017 at 17:44, STARS: 1
32mpg/1.8L= 17.78
2005 Corolla Le
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 20:36, STARS: 0
Yeah that’s really good tire wear. A dozen track days!
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 20:38, STARS: 0
Yep that’s definitely on the low end, my old Q45 would have been the same though. I got around 14 MPG average but was impressed with mid twenties on the highway.
"Noah - Now with more boost." (antriebverliebt)
12/12/2017 at 20:41, STARS: 0
41 MPG highway according to the EPA. It’s funny, I hypermiled a 2015 civic a few months ago, it managed 45 which seems a lot less impressive now.
"Distraxi's idea of perfection is a Jagroen" (distraxi)
12/12/2017 at 20:42, STARS: 1
Yes, nobody I mention it to at the track can believe it, especially after I’ve been climbing all over their asses. They’re all “no way, that’s BS!” and I’m “look: 2012 date code!”
Rears are starting to get a little thin though :-)
"Captain of the Enterprise" (justanotherdayinparadise)
12/12/2017 at 20:45, STARS: 1
I average 32 with my commute route.
"and 100 more" (nth256)
12/14/2017 at 14:25, STARS: 0
My recently-acquired 2012 Joop GC, V6, 2wd:
22 mpg / 3.6 liters = 6.111
Of course, I’m averaging the gas mileage over a week or so. I got it up to 26 mpg (and still climbing) on a trip to New Orleans. So my daily commute of 70 highway miles round-trip probably puts me up around 24 mpg five days out of the week, but running errands on the weekends, waiting at stoplights, etc. pulls the average down around 18 or 19. So I figure 22 is a fair overall average.
BUT, I got about the same gas mileage in my Patriot, with a 2.4l:
22 mpg / 2.4 liters = 9.167
So I’m not sure the resulting numbers mean much.
"Noah - Now with more boost." (antriebverliebt)
12/14/2017 at 15:28, STARS: 1
26 is really impressive for that motor and the car its in too, I don’t think I can manage that thanks to gearing. I’ll have to try resetting the odo on the highway.
"e36Jeff now drives a ZHP" (e36jeff)
12/18/2017 at 12:15, STARS: 1
My best ever full tank in the ZHP: 30mpg
30/3=10
normal MPG is around 25
25/3=8.3333333333333333333333333333333333333333
"Noah - Now with more boost." (antriebverliebt)
12/18/2017 at 12:18, STARS: 0
I’ve always been impressed by the E36/E46 non M powerplants, especially the bigger ones. 200+ naturally aspirated HP with 30+ highway MPG is great, especially for the nineties/00s
"e36Jeff now drives a ZHP" (e36jeff)
12/18/2017 at 12:21, STARS: 1
If I’d actually get out of the house at a decent hour and not have to push it on my commute, I’d be around 27-28mpg. I once did 32.7 driving from the MD/PA line north of baltimore to west VA(around 100 miles)
"Noah - Now with more boost." (antriebverliebt)
12/18/2017 at 12:22, STARS: 0
Yep my friend used to get 32ish out of his 328is. I don’t think I could break 30 lol.
"Full of the sound of the Gran Fury, signifying nothing." (granfury)
12/18/2017 at 13:44, STARS: 1
I’ll use the last fill-up in the Mazda5: 18.37 mpg (lots of twisty mountain roads and zipping up to redline for fun). I normally get closer to the EPA 21 MPG, but in mixed driving because of, well, 6MT and revs.
18.37/2.5=7.348
"Noah - Now with more boost." (antriebverliebt)
12/18/2017 at 13:46, STARS: 1
lol yep spirited driving fuel economy is always amusingly poor. I reset the odo after the reflash and its at 16 average right now...