Big?
Yes. Some do. And some don't. Some even get better mileage at 40 mph than at 30 mph. Here is an example:Is it true that an automatic car will use more fuel doing a steady 20 mph than when doing 30?
---------------------------- MPG @ 30 mph- @ 40 mph--- @ 50 mph
'68 AMC Javelin (290-cu-in)------ 24.5----------- 23.5------- 20.5
'68 Ford Mustang (289)---------- 23.5----------- 24.0------- 21.5
'68 Dodge Charger R/T (440)----- 18.0----------- 18.0------- 16.5
'68 Buick Riviera (430)----------- 19.0----------- 19.0------- 17.5
'68 Ford Thunderbird (429)------- 18.5----------- 18.0------- 17.0
'68 Mercedes 250 (152-cu-in)---- 23.5----------- 22.0------- 21.0
'68 Rover 2000 (121)------------ 34.5------------ 31.5------- 28.0
'68 Peugeot (99)---------------- 33.0------------ 31.5------- 29.0
'68 Volvo 144 (109)------------- 31.5------------ 31.0------- 27.0
'68 Ford Galaxie (302-cu-in)----------- 21.0------------ 21.5------- 20.0
'68 Pontiac Catalina (400)------- 19.5------------ 21.5------- 22.0
'68 Dodge Polara (318)---------- 23.5------------ 23.0------- 22.5
'68 Chevrolet Impala (307)------ 21.0------------- 19.5------- 19.5
'68 AMC Ambassador DPL (290)-- 22.5------------- 21.5------- 19.5
Note: the Pontiac had a very high (2.29:1) rear axle ratio which is why it got better mileage at 50 mph than at 30 mph.
Last edited by Fleet 500; 02-04-2008 at 02:03 PM.
'76 Cadillac Fleetwood Seventy-Five Limousine, '95 Lincoln Town Car.
thank you very much, in the mean time we have reached 2008, and technology has moved on, also that of autoboxes....
"I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams
"I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams
I know what you mean but I am referring to the type of course that teaches you what to do in an emergency, where to look and how to steer and brake. Driver training should be more than assing in the road rule questions and being able to park (which everyone forgets after passing the test).
Fear not Matra! We have plenty of cameras. They spend more on that technology than on building better roads I rekon. And place them in 50kph zones at the end of 60kph ones or 100kph zones at the end of 110kph ones. I wonder why that is?
"A string is approximately nine long."
Egg Nogg 02-04-2005, 05:07 AM
Wait a minute... alllow me to make a correction. There are some cars that get better mileage at 50 mph than at 30 or 40 mph. Like the Pontiac I posted before:
'68 Pontiac Catalina (400-cu-in engine, 290 hp, 2.29:1 axle ratio, 4,133 lbs curb weight)
MPG @ steady:
30 mph------------ 19.5
40 mph------------ 21.5
50 mph------------ 22.0
60 mph------------ 19.0
70 mph------------ 17.5
'76 Cadillac Fleetwood Seventy-Five Limousine, '95 Lincoln Town Car.
This isn't highly scientific but the trip computer in the BMW seems to get the best numbers (regarding range, so aplicable to fuel consumption) at about either around 80km/h (~50mph) in fifth or around 110km/h (~68mph) in sixth. However if you decrease the speed the range decreases too. And the same happens if you increase the speed.
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Visca Catalunya!
"I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams
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