According to an article I read regarding MPG and engine efficiency you may
not get better gas mileage in 5th at the same highway speed. It has to do
with cams and breathing and operating the engine at optimum efficiency which
is usually close to peak torque. If the car is lugging around in 5th it may
get better gas mileage in 4th where the engine is at its most efficient RPM.
Several years ago BMW came to the conclusion after extensive testing that
the best way to get the most MPG in city driving is to accelerate with the
go pedal fully depressed and short shifting rather than gradual acceleration
as most of us do. The idea is to keep the butterflies fully opened, the same
way a diesel operates. It's the WOT that brings peak efficiency to the
engine and allows full breathing.
Mike
----- Original Message -----
From: "Patrick P. Castronovo" <slick1@mohaveaz.com>
To: "Ryan, Richard" <RRyan@frk.com>; "'Datsun Roadsters'"
<datsun-roadsters@autox.team.net>
Sent: Wednesday, February 07, 2001 10:30 PM
Subject: Re: Gas Mileage
> If you're not kidding, and truly do not know the answer, you get better
> mileage in 5Th gear, OF COURSE!
>
> -----Original Message-----
> From: Ryan, Richard <RRyan@frk.com>
> To: 'Datsun Roadsters' <datsun-roadsters@autox.team.net>
> Date: Wednesday, February 07, 2001 5:44 PM
> Subject: Gas Mileage
>
>
> >With everyone talking about MPG I have a question.
> >
> >Assume you have a 2000 Roadster and you are driving on a flat freeway at
70
> >mph.
> >
> >Which gets better gas mileage?
> >
> >A. Fourth gear at 4,000 rpm
> >
> >B. Fifth gear at 3,200 rpm
> >
> >(I think these rpm estimates are about right. I haven't driven mine in
> >years.)
> >
> >
> >Why?
> >
> >
> >Dick Ryan ex. 24022
> >(650)312-4022
> >Risk Management Dept.
> >SM 2000/2
> >FAX (650)312-5830
> >
> >
> >
> >
> >Pat,
> >
> >You just can't compare an Altima to the roadster. Apples vs. Oranges!
> >
> >My '66 2000 cruises between 4000 and 4500 rpm at highway speeds, and I'm
> >getting about 26 mpg. I've got the 1600 rear end (3.90?). In city
driving,
> >stop and go, the mileage drops below 20 mpg, where the tach is often at
> >3000 (peppy!). Lower rpms do NOT guarantee consuming less gasoline. And I
> >know quite a few of the other BADROC'rs are getting similar mpg, about 24
> >to 28 mpg on the highway.
> >
> >Fred - So.SF
> >BADROC
> >
> >
> >
> >3800 RPM on the Highway is consuming a lot of Gasoline. My '98 Altima
gets
> >27 on the highway and it is turning at 2200 RPM @ 60 mph. You must be at
> >about 20 MPG. I know my roadster(67.5 2000 w/Solex) gives me 30 MPG on
the
> >highway. I don't know the Ratio.
> >Pat.
> >
> >
> >>Hello,
> >> I have the 4.11 LSD on my Solex U-20, I really don't think it makes
> >>that much of a difference in around town gass mileage. On the freeway I
> am
> >
> >>turning maybe 3800rpm at the super fast CA freeway cruising speeds.
> >> But I do think that it makes a difference in low rpm power. The
> >>car really does feel more peppier.
> >> Daniel 69 2000
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