BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
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 My first fill up...

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chapel

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Posts : 836
Join date : 2011-01-28
Age : 36
Location : Salem MA

PostSubject: My first fill up...   Sat Oct 29, 2011 10:07 pm

Tank MPG: 12.8

yeeeeeeeeeeeeeeeeeeeesh

any tips or tuning ideas to squeeze a bit more juice out of the lemon?
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PostSubject: Re: My first fill up...   Sat Oct 29, 2011 10:18 pm

Something is way wrong. tuneup? That is almost half of what it should be getting, unless you just have you foot into it. Laughing

You should be seeing 15-17 city and 20-25 hwy. This all depends on a lot of factors. Mechanical condition of car, overall weight, options, summer/winter, gearing. Almost everything plays a factor. Taking off easy and stopping easy. A lot of stop and go is not good for mpgs either. Tire pressure too.
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chapel

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Posts : 836
Join date : 2011-01-28
Age : 36
Location : Salem MA

PostSubject: Re: My first fill up...   Sat Oct 29, 2011 10:24 pm

IMPALADAKID wrote:
Something is way wrong. tuneup? That is almost half of what it should be getting, unless you just have you foot into it. Laughing

Lots of short trips (under 3 miles)

I think my tires could use some air too.

But I think Paul did a tune up (plugs, wires, opti...)


Last edited by chapel on Sat Oct 29, 2011 10:25 pm; edited 1 time in total
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PostSubject: Re: My first fill up...   Sat Oct 29, 2011 10:25 pm

chapel wrote:
IMPALADAKID wrote:
Something is way wrong. tuneup? That is almost half of what it should be getting, unless you just have you foot into it. Laughing

Lots of short trips (under 3 miles)
Bingo!!!!!!!!!!
That is why right there.
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chapel

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Location : Salem MA

PostSubject: Re: My first fill up...   Sat Oct 29, 2011 10:35 pm

Also, methinks it's possible that my odometer is way off because my tires aren't stock size...
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Matt Trakker

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Posts : 5081
Join date : 2009-07-30
Age : 35
Location : Reading, MA

PostSubject: Re: My first fill up...   Sat Oct 29, 2011 11:38 pm

My speedometer is off with the 295/50s on the back of the car, it's off by like 10MPH when it says I'm going 50! That's why I want to put taller tires on the back.
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96Brougham



Posts : 819
Join date : 2009-02-02
Age : 29
Location : Easton MA

PostSubject: Re: My first fill up...   Sun Oct 30, 2011 6:01 am

Full tune up was done. We consistently saw 21mpg avg highway and city, and bout 16 around town. Tires always at 35psi. Never did MPG with the SS wheels, but they're about 2" shorter than stock size
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Fishah

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Posts : 1118
Join date : 2009-01-20
Age : 30
Location : Chicago, IL

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 11:50 am

What size tires are you using?
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chapel

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Location : Salem MA

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 12:34 pm

Rears are 275/40/17
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Fishah

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Location : Chicago, IL

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 1:18 pm

That tire is 2.5 inches shorter than stock.

That means your actuall MPG is probably 10% worse. More like 11mpg.
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chapel

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Age : 36
Location : Salem MA

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 2:01 pm

I know it's a 6.5% difference in speed.
so, I'm actually turning 6.5% LESS mileage?
ugh.

is that right or is it the opposite?
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Fishah

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Location : Chicago, IL

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 2:27 pm

Because the tires are shorter, they are turning more rotations for every mile. As a result, it's telling you that you've gone even farther than you actually have. Therefore, you've actually gone less distance per galon than your calculations show.

So yea, your mileage is WORSE than 12.8mpg.
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chapel

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Location : Salem MA

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 2:34 pm

oof.
so I really only did 205.7 on 17.07gallons of gas...
so I only just broke 12mpg... Razz

what's required to get the speedometer to read correct?
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mp775

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Join date : 2011-08-24
Age : 38
Location : Pawtucket, RI / Woburn, MA

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 2:39 pm

I get 9%, not 6.5%. 11.5 mpg. That's not that horrendous if you've only been taking three mile trips. Try just going out and back on the highway without traffic for a half hour, fill up again, and see what you get.
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chapel

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Age : 36
Location : Salem MA

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 2:41 pm

mp775 wrote:
I get 9%, not 6.5%. 11.5 mpg. That's not that horrendous if you've only been taking three mile trips. Try just going out and back on the highway without traffic for a half hour, fill up again, and see what you get.
tire diameter is 6.5% different.
27.4" - 6.5% = 25.619"
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Fishah

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Posts : 1118
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Location : Chicago, IL

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 3:05 pm

chapel wrote:
oof.
so I really only did 205.7 on 17.07gallons of gas...
so I only just broke 12mpg... Razz

what's required to get the speedometer to read correct?

You will need to have your PCM tuned if you want the Speedo to read your 275/40/17 correctly.
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chapel

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Posts : 836
Join date : 2011-01-28
Age : 36
Location : Salem MA

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 3:10 pm

oh, so it's not a gear that needs to be changed?
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Fishah

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Join date : 2009-01-20
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Location : Chicago, IL

PostSubject: Re: My first fill up...   Mon Oct 31, 2011 3:24 pm

chapel wrote:
oh, so it's not a gear that needs to be changed?

Only on TBI B-Bodies is there something physical that needs to be replaced.

A 95' car will be controlled by the PCM.
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