Low gas mileage on CTR

[Andruboine]

I have a CTR and the only mods are remote start and went to 255/35/20 tire.

I drive very short distances and let my car warm up in the morning and evening for less than 10 min.

I’m consistently getting 15-17mpg.
I use premium fuel.

Is this normal?

On my old car it seemed to only track driving miles.

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[RedGiant217]

I have a CTR and the only mods are remote start and went to 255/35/20 tire.

I drive very short distances and let my car warm up in the morning and evening for less than 10 min.

I’m consistently getting 15-17mpg.
I use premium fuel.

Is this normal?

On my old car it seemed to only track driving miles.

Sounds normal for aggressive driving to me. I'm sure you're having fun

 

[ExVTEC]

Short distance driving gets lower fuel economy because you are shifting gears more often. Warming up should be a minute or 2 at most unless it's winter and you're defrosting. If you granny shift, use neutral to coast when possible it may help a little.

 

[tinyman392]

Short distance driving gets lower fuel economy because you are shifting gears more often. Warming up should be a minute or 2 at most unless it's winter and you're defrosting. If you granny shift, use neutral to coast when possible it may help a little.

I feel like I get better gas mileage while coasting in gear (when the wheels drive the engine so no gas is needed).

 

[8877]

What does warming up mean/ex-/include? Do you drive the car then or let it idle for 10 minutes without moving at all?

The best way to warm up an engine and keep mpg down is to drive it (conservatively). All other methods attribute to (very) low mpg and harm the engine unnecessarily.

 

[TypeSiR]

The wider tires that are 5% larger in circumference don’t help with mpg. Combine these with cold temps and short drives, I think that’s about normal.

https://www.wheel-size.com/calc/?wh...-20X8.5ET60&fcl=50mm&scl=50mm&wcl=30mm&sr=0mm

 

[Andruboine]

The wider tires that are 5% larger in circumference don’t help with mpg. Combine these with cold temps and short drives, I think that’s about normal.

https://www.wheel-size.com/calc/?wh...-20X8.5ET60&fcl=50mm&scl=50mm&wcl=30mm&sr=0mm

That’s what I figured but was just checking in.

 

[Andruboine]

Sounds normal for aggressive driving to me. I'm sure you're having fun

Yea I think that’s part of it for sure haha. I can’t help but rip to the speed limit sometimes.

 

[Andruboine]

The wider tires that are 5% larger in circumference don’t help with mpg. Combine these with cold temps and short drives, I think that’s about normal.

https://www.wheel-size.com/calc/?wh...-20X8.5ET60&fcl=50mm&scl=50mm&wcl=30mm&sr=0mm

Yellow looks sick btw.

 

[willskiGT]

What does warming up mean/ex-/include? Do you drive the car then or let it idle for 10 minutes without moving at all?

The best way to warm up an engine and keep mpg down is to drive it (conservatively). All other methods attribute to (very) low mpg and harm the engine unnecessarily.

This. Modern vehicles should not be idled to "warm them up". Get in the car and drive it.

 

[GraphiteAZ]

I feel like I get better gas mileage while coasting in gear (when the wheels drive the engine so no gas is needed).

That's not how this works. At all.

 

[tinyman392]

That's not how this works. At all.

Fuel injectors are shut off when you're completely coasting. The moving momentum of the vehicle is transferred through the wheels, then transmission, to the flywheel to turn the engine.

Edit: the vacuum created by the motor aids in engine braking during this time as well.

 

[GraphiteAZ]

Fuel injectors are shut off when you're completely coasting.

So your engine idles without any fuel?

 

[tinyman392]

It's not idling. The car is in gear with zero load because the wheels are turning the engine, instead of the engine turning the wheels.

When you coast slow enough to where the wheels can't turn the engine, it will start lugging.

Idling is when the car is in neutral and the engine is spinning freely.

Though the CTR has some nice anti-stall features that stopped the motor from dying. In 1st gear it'll roll smoothly at 4MPH without any throttle input (ECU pushes the motor) and 7-8MPH in 2nd. Makes stop and go traffic much easier. Obviously don't try to accelerate hard if you're at those speeds though.

So your engine idles without any fuel?

Ducky did a good description above. The motor will coast (in gear) without any fuel until the antistall features kick in. For example if you're coasting down from 20 MPH in 2nd gear and drop below 12, I believe the vehicle begins to use gas again. As you continue to coast down in 2nd gear, you'll eventually hit 8 where the vehicle will continue to keep your motor at idle RPMs (around 800 or so) keeping you at a constant 7-8MPH. At this point, hitting the brakes will stall you out if you don't disengage the clutch.

 

[Jpierro79]

I have a CTR and the only mods are remote start and went to 255/35/20 tire.

I drive very short distances and let my car warm up in the morning and evening for less than 10 min.

I’m consistently getting 15-17mpg.
I use premium fuel.

Is this normal?

On my old car it seemed to only track driving miles.

Where are you shifting at ? All my shifts vary I shift as low as 2400 when cruising. If your shifting at 3500 every time that’s your answer. Now if your keeping the revs below 3k i suspect faulty air fuel sensor. Check spark plugs see if they are black. Honestly those are you only your 2 real possibilities.
Actually slight chance faulty mass air meter. Was it always like this. Did you change the intake?

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