Thread: What calculates the MPG display? + Instant MPG

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  1. #1 What calculates the MPG display? + Instant MPG 
    It's Slow LS1GTP's Avatar
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    Curious to know how the car knows the MPG it's getting. Is it from the PCM?

    I was wondering if I could mod it to read instant MPG, and if anyone has done it before. Did a search with no luck.
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  2. #2 Re: What calculates the MPG display? + Instant MPG 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Yeah its a instant reading.

    On a Aeroforce scan gauge there is a Instant MPG option to view, its the same thing the DIC uses to figure out mpgs and give you a rough avg of what you are getting.

    Not sure if its even possible to make it read instant, but who knows.

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  3. #3 Re: What calculates the MPG display? + Instant MPG 
    GT Level Member Tony Mendez's Avatar
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    Typically it's a calculation based on PCM inputs... Engine load, TPS, VSS, etc.
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  4. #4 Re: What calculates the MPG display? + Instant MPG 
    Killa Bee Scottydoggs's Avatar
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    buy a regal, its got instant mpg....

    some how im sure it works off the engines vacuum.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  5. #5 Re: What calculates the MPG display? + Instant MPG 
    GT Level Member addzradd's Avatar
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    I was under the impression that it was injector duty x rpm/ mph.
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  6. #6 Re: What calculates the MPG display? + Instant MPG 
    GTX Level Member nos4blood70's Avatar
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    Bonnevilles have instant too. :P

    I'm thinking it uses the MAF sensor.
    -Carl
    "Penelope" - 145k Miles 2003 Bonneville SLE


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  7. #7 Re: What calculates the MPG display? + Instant MPG 
    It's Slow LS1GTP's Avatar
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    You're probably all correct, lol. Kinda figured it was a stretch.
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  8. #8 Re: What calculates the MPG display? + Instant MPG 
    GXP Level Member Timing's Avatar
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    the joys of having an 04 i have instant and average
    08 MazdaSpeed 3- Treadstone tr8l, Ebay Piping, Ported intake,Thermal gasket, Cs Injector Seals,Cobb intake/inlet, Autotech Internals, Poly mounts, Speed Daddy DP, Magnaflow CB,
    RPF1 17x9 255/45 Direzza Zll
    04 COMPG- Vs, getrag 284 RIP
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  9. #9 Re: What calculates the MPG display? + Instant MPG 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    On 04+ only the 5 button DIC has it.

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  10. #10 Re: What calculates the MPG display? + Instant MPG 
    GXP Level Member Timing's Avatar
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    yay for me
    08 MazdaSpeed 3- Treadstone tr8l, Ebay Piping, Ported intake,Thermal gasket, Cs Injector Seals,Cobb intake/inlet, Autotech Internals, Poly mounts, Speed Daddy DP, Magnaflow CB,
    RPF1 17x9 255/45 Direzza Zll
    04 COMPG- Vs, getrag 284 RIP
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  11. #11 Re: What calculates the MPG display? + Instant MPG 
    GTP Level Member dazedandconfused's Avatar
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    I was just wondering this very thing today. For a 16 year old car I'm surprised how close my dic reads the avg fuel economy. Its consistently between .5-.8 mpg hand calculated when compared to the dic

    Sent from my DROID RAZR HD
    97 gtp, cone filter mod, downpipe and glasspack to stock muffler mod, 180* t-stat mod, bad driver mod
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  12. #12 Re: What calculates the MPG display? + Instant MPG 
    GXP Level Member coolone's Avatar
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    Make sure your speedo is set correctly... I'm sure that figures in to the equation!
    just sayin...
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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