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Sunfire Vs Bonneville Fuel Consumption Test

I decided to test these two cars for fuel consumption this weekend. It is an approximate figure as I do my best to fill up the car to a point where it almost overflow.

Test vehicles: 2000 Pontiac Sunfire GT with automatic transmission. Engine type 2.4 L Fuel type: Regular

1993 Bonneville SSEi with automatic transmission. Engine type 3.8 with supercharged Fuel type: Premium

Test Conditions:

1/ proper tire pressure were verified. Both cars has 16 inch tires 2/ same amount of passengers (4 passengers about 670 lbs including the driver) 3/ Bonneville SSEi (1993 with > 190,139 miles (306,000 km) on the motor and good running engine and has roof rack with a bike on top. 4/ Sunfire GT has 40,389 miles (65,000 km) on the motor and good running engine 5/ Air condition "OFF" 6/ Average speed = 70 mile/hour with excellent road condition (no hill). 7/ Unfortunately: Bonneville trip was driven during a windy day (not sure about the wind speed but more than a breeze with outside temperature 59 F) 8/ Sunfire was driven on nice calm day with outside air temperature of 68 F 9/ Total trip distance= 155.34 mile (250 km)

Results: a/ Sunfire GT: 29.62 mile/gallon or 12.59 km/liter b/ Bonneville SSEi: 22.31 mile/gallon or 9.48 km/liter

I thought I could get a bit more mile per gallon with the Bonnie. Oh well, Bonnie ride was much more pleasant and comfortable than Sunfire.

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Different strokes for different folks, good that GM can make a decent car that does 30mpg though, I love that new ecotec motor, when its design characteristics penetrate further into GM's engineering department we'll see some really cool stuff.

Reply to
Paradox

FWIW, going from TX to the Grand Canyon with my Bonneville SLE (normally aspirated 3.8) it averaged 29MPG. On trips to Houston (180mls), my Intrigue (3.5 DOHC V6) gets up to 32MPG.

Reply to
Neo

Aaah but were you driving 70 mph? I routinely get 36+ mpg highway on my

2002 Impala with the 3.4 liter engine and I get 17 to 20 mpg highway on my 1990 Suburban with the 5.7 Liter engine and 183,795 miles on it. This is on trips to the Carolinas where speeds range from 60 mph to 70 mph. Too many people don't know (nor do they care) how to maintain a vehicle to get the best fuel mileage from it. With things the way they are today, I'm surpised that the national speed limit of 55 mph hasn't been re-introduced (after all, it was initially established to save gas).

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% There are two classes of pedestrians in these days of reckless motor traffic - the quick and the dead. ~ Lord Dewar 1933 ~

Climbing into a hot car is like buckling on a pistol. It is the great equalizer. ~ Henry G. Felsen 1964 ~

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Rich B

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SgtSilicon

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SgtSilicon

Rich B wrote in alt.autos.gm

After I bought an 88 Buick Park Avenue, 3.8, I drove it mostly around town and got only about 15-17 mpg. Then I drove it about 300 miles across state and got a little over 30mpg. I a have made that trip many times and everytime I got worse mileage on the way back than on the way over. Ended up getting over 35 mpg coming back. Needless to say, I was very impressed with the difference.

Reply to
Dick C

Anywhere between 70 and 75MPH.

Reply to
Neo

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