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Old 11-28-2016, 09:04 AM   #1 (permalink)
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Mitsubishi Evolution 10 DCT - only 19 MPG

I have an 08 evo 10 with a 2L MPFI dual VVT motor and a 6 close ratio speed dual clutch transmission. At 60mph I'm roughly churning 2750 rpm. I have increased part throttle ignition timing and retarded intake valve timing (Atkinson simulation). However what I found is I barely cruise in that region due to stop and go traffic style driving. I'm currently averaging 19-20 mpg combined which is horrific for a small motor although under boost it is capable of putting down 300ft lbs of torque at 3500 rpm. Similarly a friends CLA45 averages nearly 25-26 mpg. I haven't been able to find a BSFC map for this car but I have been trying to avoid boost and accelerate at 1800-2200 rpm.

I can tune the ecu however way I like it such as reducing ignition timing under boost at low rpm so I can lean out the mixture or add more timing and less boost and less fuel. VVT can be tuned...different strategies can be carried out but I'm not sure which would be best. Tire pressure is already near maximum and I have reduced weight as much a single possible which helped my track times but not much my city fuel economy. any advice is appreciated .

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Old 11-28-2016, 10:34 AM   #2 (permalink)
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My '91 Celica all-trac/GT-FOUR averages 20mpg and goes about 3100Rpm@60mph

Runs a bit richer than Europe/California emission-equipped cars (No cat)

That's why I have a daily
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Old 11-28-2016, 10:36 AM   #3 (permalink)
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But the AWD-fulltime system is the biggest reason for your low MPGs.

And EOC+Start/stopping is a no no on a performance-oriented car.
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Old 11-28-2016, 10:37 AM   #4 (permalink)
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You're right where it's supposed to be, at 19 mpg.
https://www.fueleconomy.gov/feg/noframes/25165.shtml

It weighs 3500lbs, it's a small(ish) turbo-charged engine, it's a sports car...it's not going to get stellar fuel mileage whatever you do.

Yes, I know, how very unhelpful of me. Sorry, but ya gotta face the facts, IMO.
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Old 11-28-2016, 10:49 AM   #5 (permalink)
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...I am going to tune my celica even more in the future. it's a car where it's Smiles per gallon

I agree with Stubby, not really much you can do. (unless you convert it to gas)
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Old 11-28-2016, 11:35 AM   #6 (permalink)
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Quote:
Originally Posted by Stubby79 View Post
You're right where it's supposed to be, at 19 mpg.
https://www.fueleconomy.gov/feg/noframes/25165.shtml

It weighs 3500lbs, it's a small(ish) turbo-charged engine, it's a sports car...it's not going to get stellar fuel mileage whatever you do.

Yes, I know, how very unhelpful of me. Sorry, but ya gotta face the facts, IMO.
But how does the cla45 achieve much better consumption? I'm guessing they are using Atkinson cycle timing with lean burn or delayed open loop fueling.
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Old 11-28-2016, 03:06 PM   #7 (permalink)
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Quote:
Originally Posted by ever_green View Post
But how does the cla45 achieve much better consumption? I'm guessing they are using Atkinson cycle timing with lean burn or delayed open loop fueling.
I would guess that the driving conditions are different. When I owned a similar car the best economy was obtained by using the highest octane fuel available and driving like a granny. Even then it was pitiful.

These cars are designed to go like stink and economy is not what they do.

Is it the Mercedes you are comparing it to? If so then have a read about the technological differences in the engines. The merc has stratified direct injection which will explain the difference.

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Old 11-28-2016, 07:18 PM   #8 (permalink)
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My R32 Skyline gets around 24MPG without hypermiling of any sort, RB series engines run really rich, so there'd be a few MPG to be gained from a good tune.

However, I can also see how if used in peak hour that number could be worse.

One of our members was EOCing his WRX, and a lot of factory turbo cars have stop/start these days. That's where the biggest gains in peak hour are to be had.
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Old 11-29-2016, 09:26 AM   #9 (permalink)
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You're getting hit on all fronts. It's so bad that the EPA rates your highway mpg the same as a Dodge Viper. You may have one of the worst cars to drive for fuel economy because anything to increase it is directly against it's performance. Other than reducing weight I can't think of anything good for a performance car like that without taking away why you drive it. But there is one. Engine/trans heaters. A very small weight gain but you'll skip the harsh of the cold. In Toronto, I imagine it gets pretty cold.
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Old 11-30-2016, 01:57 PM   #10 (permalink)
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My cts gets 24 to 28 mpg, all highway. 2100 rpm @72 mph. Hopefully better now with a new battery. My brother in law got rid of his evo because of the horrible mileage, and the expensive tires.

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