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Discussion Starter · #1 ·
2.4L

MPG: Up to 20 city / 28 highway



I am getting 18-19 consistently with my MPG app. I do a lot of city driving and when I drive the interstate its for about 20 miles and I am running 80MPH so the RPMs are a little high.


Do you think the interstate RPMs are killing my MPG? I dont redline the thing but I am letting the tranny shift around 3K rpms.

Also with the cooler weather I was expecting better numbers....

I dont think my tires are that big of a factor I have the General G Max. Also I have the 18in rims soooo thats a SMALL factor.

Real world numbers for this car are.


EPA: 20 combined. City MPG:17. Highway MPG:25

Self Reported: 18 - 27 combined, many reported in the low 20s

http://www.fuelly.com/car/mitsubishi/eclipse/2008


This week I am being super careful about driving with a light foot and we will see how much different it is for me. I will report back to you in few days. I am going to work here in a min and that will be 20 interstate mile for the day. I am going to drive 70 instead of 80.


Also going to recheck my tire pressure.
 

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City driving is whats gonna kill your mpg. I drive the canyons to work about 45 miles from where I live. I keep the rpms in the 2k-3k range and get up to 70 at max and I get somewhere from 22-24 mpg depending if I drove my car in the city that week. Which looking at numbers before on other threads seems to be the norm for the GS.
 

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2009 GS Turbo. 2006+2007 GT
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55mph I get about 34mpg, 80mph I get about 20mpg. Speed just wrecks my economy.

Super light foot and pissing off traffic behind me, I've managed 43mpg city. I've definitely not been a model of fuel economy on my current tank of gas, but I'm sitting around 25mpg with it, mixed city and highway... And having fun. It could definitely be higher.
 

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Have you seen a significant difference with hakish tune? I know the tune says that your fuel economy will go up but I haven't seen anyone ever make a clame of a difference before and after.
 

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2009 GS Turbo. 2006+2007 GT
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I can get my tools out, find a section of road, and use the OBD info to compare approximate MPG readouts going down the road at the same speed in the same direction. Do a couple runs with, and a couple without...

What I do know is that I run about 0.4 seconds faster on a quarter mile. The biggest fuel economy gain for me was losing all my cats and having a long tube header instead
 

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I short shift in city driving, usually upshift around 2000 rpm. Set the cruise on the highway at 110 km/h (68 MPH) and I'm spinning @ 2100 in 6th.

Fuel economy is supposed to be better with Hackish's tune, but I haven't really been paying attention to that if I'm totally honest
 

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I short shift in city driving, usually upshift around 2000 rpm. Set the cruise on the highway at 110 km/h (68 MPH) and I'm spinning @ 2100 in 6th.

Fuel economy is supposed to be better with Hackish's tune, but I haven't really been paying attention to that if I'm totally honest
I need to follow your example. Part of the reason why my fuel economy isn't great is that I tend to run about 80 mph/129 kph on the highway, which spins the engine around 2600-2700 rpm, and sucks up precious premium. Also, while I try to short shift, one of the reasons for owning a GT is that the engine sounds darn good when you let it spin up a bit. I'm going to make an effort to be a good boy this week, and see what kind of mileage I get.
 

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One week of good behaviour sounds really hard. Good luck.
I already failed. Was boxed in behind some chuckleheads doing 62 in a 65. Had to squirt into an opening in the left lane or risk being trapped there for another mile, so I downshifted to third and gave her a bootful.
 
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