MPG question

[Guitarplayr]

Just bought a 2016 RS hatchback with the 1.4 turbo. While comparing it to an LT with a 1.8 and an LTZ with the 1.4 turbo I noticed both those cars are rated at 3 highway but the RS was on 33.

Looking at the spec differences to the LTZ I an not understand why the drop in MPG.

anyone know why? Is it actually tuned that way?

 

[nickalltogether]

RS has shorter gearing so it requires more rpm to go the same speed as the LTZ.

 

[zippypcs]

Final drive ratio. I have an LTZ and my buddy had an RS. Both 6 speed manuals.
Mine gets 41-42 hwy @70. His RS ,because is geared different, gets 36-37 hwy @70.

My RPM's avg. 2100 @70. His RPM's avg. 3000 @ 70.

 

[Guitarplayr]

Ah

So the fact my RS has a 3.23 final drive and the LTZ has a 3.53 final drive is the issue?

I get faster acceleration but lower mpg and in theory lower top speed?

 

[zippypcs]

If I remember correctly the RS has a 4.10 final drive ratio.
My LTZ has a 3.65.
Some one step in here if I am wrong please.

 

[zippypcs]

Also 6 speed manny or auto makes a difference as well.

 

[Guitarplayr]

oops

reverse that. According to chevy the RS has the 3.53 and the LTZ has 3.23, with the LT in between with 3.47

These are all automatics, by the way.

 

[zippypcs]

Yes automatic trans is different than manual with final drive ratios.

 

[Victory Red RS]

I have a RS 6 speed and averaged 42 mpg before I tuned it.

 

[zippypcs]

That is very good. I have to run on the freeway for a good bit before low 40's.

 

[Victory Red RS]

That's highway mpg by the way. City was more like 25.

 

[sleepybird09]

I average 31-32mpg. City/hwy mix with rush hour traffic.
This is the number I see on the mpg info. Iv never average anything close to 35mpg. (I drive like a grandma).

I do notice that if I'm cursing say 45mph and I reset the mpg meter it will show I'm doing about 40-42mpg. However eventually it will end up at 31/32. If I'm lucky 33.

I find myself stopping to fill up 1 a week usually on a Sunday. Kinda sucks because I was also filling up 1 a week on Sunday in my lt1 camaro that was in rough shape. I'm guessing the fuel tank is segnificantly bigger in the maro.

If I had to do 1 wishful mod for this car it would be the ltz 1st gear and ltz 6th gear. Keeping 2-5 rs gears. (I don't know if they are different but it seems like it is.)

I know the Honda crowd they get gears changed in their cars all the time. I might look into it and see how much it would cost to get the gear set up i would like.

Thoughts on this?