Question for Will Mpg - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
All about MPG All about maximizing your Miles Per Gallon (MPG)

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post #1 of 36 (permalink) Old 01-22-2010, 03:43 PM Thread Starter
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Question for Will Mpg

is it better to drive really fast on high ways (above 75mph) or is it better to drive under speed limit (below 75mph)....

the speed limit on I-44 is 75 mph and i heard going 60 is the best on a cars mpg

that is what this thread is all about, which speed limit is best on gas

thank you!!!
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post #2 of 36 (permalink) Old 01-22-2010, 03:59 PM
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I may not be Will, but I'm trying to beat him to the punch lol.

The slower you go in your cars highest gear is always better for you. I drove about 140 miles yesterday from school to home going about 68mph in 5th gear. I averaged 32.8mpg. Not bad for 260 horsepower.

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post #3 of 36 (permalink) Old 01-22-2010, 04:16 PM
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yes, any speed over 65 fuel economy starts to drop off as it takes more and more power to make up for the increase in drag



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post #4 of 36 (permalink) Old 01-22-2010, 05:33 PM
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They are correct, but try not to think about it in terms of mph. If you really want to max your mpg you have to drive by your instant mpg display and not your speedo. Here is an example:

I took I40 to work today instead of my normal two lane road because I had to stop at a store. I got on the interstate and sped up to 65 mph. I then leveled out my speed, and started letting up on the peddle. I got my instant mpg monitor to 44, and kept it there by varying the pressure on the peddle.

When I went up hill the car slowed down, and I had to let up on the peddle to keep my mpgs at 44. When I went downhill the car would speed up and I had to give it more gas to keep the car from going over 44. This caused my speed to vary from 50 mph to 70 mph.

In short (I know, too late) if you are looking for mid 30s drive slower. If you are looking for 40 and beyond, you have to work at it.

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post #5 of 36 (permalink) Old 01-22-2010, 05:47 PM Thread Starter
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sounds great...i plan on going to tulsa, oklahoma tomarow for a friends bball game and it is guna be my first trip that lasted longert then 20 minutes lol


SANTA FE HIGH SCHOOL EDMOND, OKLAHOMA!!!! 10-0 BABY GOING TO STATE SOON!!!!!

f yah
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post #6 of 36 (permalink) Old 01-22-2010, 05:51 PM
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Try the driving by your mpg monitor for awhile... I think you will be amazed by the results. My 42 average is combined city and hwy, and my car has no mods except increased tire pressure, so it can be done. It just takes a lot of practice.

Most importantly, have a safe trip.

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post #7 of 36 (permalink) Old 01-22-2010, 06:48 PM
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YouTube - chevy cobalt 46 mpg
55mph on a stock 2.2, with cruise control on.... i was always told forbest MPG stay right at 55.

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post #8 of 36 (permalink) Old 01-22-2010, 06:55 PM
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As mentioned, no set mph for max mpg. You want to be going just above your highest gear. When you accelerate, keep the rpms between 1500-2k.

^^<==---___-A_m_e_r_i_c_a_n M_u_s_c_l_e-___---==>^^
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post #9 of 36 (permalink) Old 01-22-2010, 07:02 PM
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Quote:
Originally Posted by Will mpg View Post
If you are looking for 40 and beyond, you have to work at it.
huh ?

Quote:
Originally Posted by xyankees214x View Post
55mph on a stock 2.2, with cruise control on.... i was always told forbest MPG stay right at 55.
I BELIEVE THIS ^ didn't watch the vid though.

I drive a road sometimes 170 miles and with my
cruise on and set at 55......
I get between 45 and 48 MPG
I have a tune, 2.4, auto

go to 65 and drops to 36-40 MPG

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Last edited by Cherry GT; 01-22-2010 at 07:05 PM.
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post #10 of 36 (permalink) Old 01-22-2010, 07:18 PM
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Quote:
Originally Posted by Will mpg
Quote:
If you are looking for 40 and beyond, you have to work at it.
huh ?
he means you need to seriously adjust your driving to consistently hold 40mpg

^^<==---___-A_m_e_r_i_c_a_n M_u_s_c_l_e-___---==>^^
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