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Thread: Best MPG on Motorway...

  1. #1
    Regular Member Dane-10's Avatar
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    Default Best MPG on Motorway...

    Over the past couple of days ive done some motorway miles, and have started to notice that im getting a better MPG in 5th Gear @ 70mph over 6th gear @ 70mph.

    Whats the point in 6th gear when there is a speed limit of 70 and that gear doesnt do as good MPG as 5th.

    Its in a 1.9 cdti (remapped)

    5th gear sits at around the 2400rpm, and 6th sits around 1900rpm for 70mph.

    Any one else noticed this?

  2. #2
    North West Regional Organiser paulvectrac's Avatar
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    Vehicle : vectra

    Trim : vxr

    Engine : 2.8 v6 turbo

    Year : 2007

    Default

    50 in 6th 90.2 mpg lmao
    Vectra vxr custome remaps egr deletes dpf and diagnostic work all remaps are custome bench tuning avalible all genuine equipment PM for info

  3. #3
    Regular Member Derek Mc's Avatar
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    Over the long run 6th does give better returns as the engine is turning slower hence using slightly less fuel, I can manage 58mpg on my daily 100 mile commute keeping to the limit in 6th on clear runs, and am on an average of 53.2mpg on the last 180 gallons used including city country m/way and congestion driving in rush hour

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    Regular Member Dane-10's Avatar
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    Mine really wouldnt like 50 in 6th what so ever. Would near enough be ticking over!!!! haha Got me confused now, why mine is like this. I did 100 miles today and i was doing 58mpg with some motorway and town driving. which im happy with, just find it odd on the motorway i can get a better MPG in 5th than 6th at 70mph

  5. #5
    Regular Member BYGino's Avatar
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    Quote Originally Posted by paulvectrac View Post
    50 in 6th 90.2 mpg lmao
    Not for me LOL 50 in 6th = 32MPG tops (2.8 Auto) time to go back to diesel I think!

  6. #6
    Regular Member veclee's Avatar
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    Vehicle : vectra c

    Trim : club

    Engine : 1800

    Year : 05

    Mileage : 63000

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    Best mpg is only achieved on the back of a rac wagon lol and you can have a kip with out worries

  7. #7
    Regular Member Chris SRi's Avatar
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    Maybe you need to go faster than 70mph for the engine to have enough torque in 6th to keep you going while getting good economy?

    You might be labouring the engine if its like that.

    By no means an expert, but could your car be suffering from low end power?

  8. #8
    Regular Member Chris SRi's Avatar
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    Oh- and about 50mpg in my 1.8 VVT doing 70mph at just under 3000rpm.

  9. #9
    Regular Member Derek Mc's Avatar
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    The 1.9 CDTi works at it's best over 1500rpm and on the motorway 70mph is right in the middle of the powerband for the engine. I think if you repeat the test a couple of times on the average economy 6th will always prove more economical than 5th mile for mile.

  10. #10
    Regular Member Dan_BlackSRi's Avatar
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    Vehicle : Vectra SRi

    Trim : XP NAV

    Engine : 1.9 CDTi 150

    Year : 2007

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    Quote Originally Posted by Chris SRi View Post
    ....but could your car be suffering from low end power?
    That's not a bad shout.

    I have found that 67mph in 6 gives me the best economy on the motorway, I can easily achieve mid 60's doing that (mine is mapped too).

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