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Supercharger Typical Gas Mileage?

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Supercharger Typical Gas Mileage?
#1
ted535is Ted S
Allentown, PA, USA   USA
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1974 MG MGB GT
I installed a Moss supercharger on my 1974 MGB-GT with a relatively fresh but bone stock engine, stock manifold w/ANSA exhaust, OD trans and new Schlemmer distributor. I've tuned the carb "lean of peak" at idle. I've also checked for intake leaks, etc. I run 93 octane top tier (Shell, Exxon, etc.) gas only. I'm very happy with the way the car runs. However, typical fuel mileage so far has been in the low 20 mpg range. Doesn't seem to matter whether it's a 70mph cruise or taking the long, winding way the mileage stays just above 20 mpg. I've been light on the throttle trying to improve cruise mileage before i take it on a long trip in the near future.

What kind of mileage do you get with your SC? Should I be looking for something that would improve the economy?

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Re: Supercharger Typical Gas Mileage?
#2
Kerr Avatar
Kerr Platinum Member Norm Kerr
Ann Arbor, MI, USA   USA
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1974 MG Midget
A supercharger puts more air and fuel into your engine, making it perform like a larger one.

To improve your economy you could remove it.

Or you can enjoy the power!

smiling smiley


Norm

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Re: Supercharger Typical Gas Mileage?
#3
bcr72 Avatar
bcr72 Ben Ragusa
Cherry Hill, NJ, USA   USA
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1972 MG MGB
Hi Ted,
I installed the SC on my B in the spring and recently started looking at the MPG. I'm at about 21-22 mpg, but I think I drive it fairly aggressively. I'm still not sure that it I have it all dialed in yet either. I am interested to hear what others are getting, mostly as a way of proving I have everything set up right.
Ben

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Re: Supercharger Typical Gas Mileage?
#4
LaVerne Avatar
LaVerne LaVerne Downey
Fruita, CO, USA   USA
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1954 MG TF "Green Hornet"
1969 MG MGB "The Beater"
1979 Triumph TR8 "Turd 8"
I get 25- 27 regularly and put my foot in it every chance I get.

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Re: Supercharger Typical Gas Mileage?
#5
Steve S Avatar
Steve S Gold Member
Abingdon, So Cal, USA   USA
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1925 Ford Model T
1937 MG SA Saloon
1939 Ford V8
1946 Other Not Listed    & more
Just like a normally aspirated engine, it depends on how it's built and how you drive it. I typically get around 19-20 MPG, and up to the mid 20's if I drive very carefully, which is pretty much never. On a couple other B engines without blowers I get low to mid 20's. On another that used to be set up more sedately I got over 30 at times.

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Re: Supercharger Typical Gas Mileage?
#6
RAY 67 TOURER Avatar
RAY 67 TOURER Ray Marloff
Fort Bragg, CA, USA   USA
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1967 MG MGB "My Girl"
After 13 years of heavy use, I still see around 28 mpg. Before installing the supercharger, and running a Weber DCOE for 10 years, I barely broke 20 mpg. RAY

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Re: Supercharger Typical Gas Mileage?
#7
Denis Avatar
Denis Denis Hill
Bearii, Nth Victoria, Australia   AUS
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1968 MG MGB MkII
1973 MG MGB V8 Conversion
On a cruise I get the same as before the supercharger. 32 MPG (imp gallons) For best operation and throttle response your Idle mixture should be set a little on the rich side of fastest idle. Denis


68 B roadster, Daffodil yellow, supercharger, Burgess SC head, SC cam, Mikuni HSR 48 carburetor and engine built for supercharging.

73 BGT V8 conversion starting with a bare shell. Built the engine "3.9L Rover" early in 2016 with high comp pistons and a few other nice bits, plus a T5 ford trans. Started on the body late 2016 and complete late 2017, Did all the work myself, mechanical, body. paint etc.
Finished and going well, great to drive and quick. Now has a nice 3.23 LSD.

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Re: Supercharger Typical Gas Mileage?
#8
gray Avatar
gray Graham Moore
CAMBRIDGE, CAMBRIDGE, UK   GBR
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1972 MG MGB GT
ted
an AFR sensor/gauge will help you to understand where you are perhaps running lean or rich. i found both moss supplied BCA and BCG to be very rich on cruise when boost fuelling was about right.

i now have profiled my own needle (as has denis) and get about 25 (UK gallons), but i also have no bypass as it's a home built charger. that is average and to be fair, mostly using right foot on UK country roads - so expect i could get a few more cruising.

G

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Re: Supercharger Typical Gas Mileage?
#9
Mano864 Avatar
Mano864 George H
Rowville, Victoria, Australia   AUS
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1972 MG MGB MkII "Sam (Samantha)"
Ted,
Similar to Denis and Graham, with a re-profiled needle I get around 28mpg imperial on highway and 24mpg around town.
I drive her like I stole her unless she who must be obeyed is in the passenger seat.
George

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about 6 years and 6 months later...
Re: Supercharger Typical Gas Mileage?
#10
tomkottmeier Avatar
tomkottmeier Tom Kottmeier
San Marcos, CA, USA   USA
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1974 MG MGB GT
Hi all,

I'm late into this discussion but something strikes me right away: some of the writers are on Imperial gallons and some on US, big difference! Imperial is the equivalent of 5 quarts US... actually .83! that, I think, will account for the differences reported.

While I'm at it, what do drivers report mileage is on normally aspirated '74 GTs?

Cheeers!

Tom

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