fuel efficent boners - Page 3 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1987-1991 Parley with regards to your 1987 to 1991 Bonneville, Olds 88 or Buick Le Sabre Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-09-2005, 12:43 PM   #21
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FYI, due to a mention earlier in this topic......fuel injectors and fuel filters will have no effect on mileage unless they're leaking.
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Old 04-09-2005, 02:21 PM   #22
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Not necessarily. If you have a leaking injector or fuel filter, you will run lean. This will cause the ECU to compensate, thus using more fuel. Right? Either way, the fuel filter should be replaced when you do a tune up.


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Old 04-09-2005, 03:00 PM   #23
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You guys are lucky!

Here in good old Germany my "C" Bonnie has a combined gas mileage of 16-18 mpg. That is mostly short distance trips in the city. Occasional highway runs with 80-120mph. I wish I would be getting more than 18mpg :(
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Old 04-09-2005, 03:50 PM   #24
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On the Vin C I have done 28-31 on the road... And that was between 75-85 mph... I'd love to know what it would do if I cruised at 70mph with no foot work..

On the Vin K I have done between 29-33... If I cruise at 75mph( cruise ) I usually do 32.. The best I have seen is 33.. The worst I have seen on the road with several runs past 100mph was 27..

I think the 91 was rated for 18cty and 28 hwy

The 95 was rated 19cty and 29hwy...

I have pretty much always beat the highway rating

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Old 04-09-2005, 04:26 PM   #25
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Sounds like you need a tune up my friend. I get 19mpg city/highway combination [50/50]. It is probably 13 city/23hwy. Well, it was. Once I get the enigne complete, I should be sitting at a much better number.

120mph huh? How does that feel? Car still good on control and such?


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Old 04-09-2005, 04:51 PM   #26
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Think 16-19 in town is pretty typical. When accelerating even mildly you get around 5 mpg so the more you stop/start the worse the overall mpg will be. Also at low speeds the engine is using more power to turn itself then to move the car - when you talk mpg, a 3800 is really a big engine any more. For real milage you want a 600 cc (ml ?) Smart Car aka the "enclosed wheelchair". My wife is now fixated on one.
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Old 04-09-2005, 05:04 PM   #27
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Quote:
Originally Posted by opensourceguy
Sounds like you need a tune up my friend. I get 19mpg city/highway combination [50/50]. It is probably 13 city/23hwy. Well, it was. Once I get the enigne complete, I should be sitting at a much better number.

120mph huh? How does that feel? Car still good on control and such?
Well, my engine is tuned up pretty well. Just had new plugs and wires, even the spark module was changed. Filter and oil are also spankin new. I am ok with the mileage I get. Mostly I drive just for a couple of miles where the engine is nowhere nearly heated up, hence it burns alot of more fuel.
When I am on the highway (=autobahn) and drive at around 80mph I get 23-24mpg.

At 120mph she actually feels pretty stable. I have to acknowledge that it is comfy riding that fast. Maybe that is due to the fact that I have the F41 "Suspension system, front/rear, firm ride & handling" option code.

But I dont do that often since I am too worried about the gearbox overheating. Bonnies (and most other american cars) are just not build to be raced at a sustained speed of over 100mph. I just keep that in mind and usually go somewhere around 80-90mph with the cruise control engaged
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Old 04-09-2005, 07:05 PM   #28
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Wow, that'* friggin' awesome.. 100mph just about made my **** myself. Maybe because I am an inexperienced driver, or perhaps because I felt like I had no control over the car. I too, have the F41 Suspension, however when that is 16 years old, it really doesn't mean much.

If you really wanted to travel 120 consistantly, I am sure you could. Just add a transmission cooler, and you are good to go. They are about $50, and you could install it yourself [the lines to the radiator are already there, just hook the cooler up before the radiator, then cooler output -> radiator input. radiator output -> tranny]. Not too difficult. And once you have that, there are no worries about overheating anything. And the main cause of overheating is surprising the tranny [N bombs, one wheel wonders, WOT from lights {consistant, nothing wrong with occaisonal}, driving aggresively before the car warms up]. Just keep that fluid deep red, and topped off. You'll never have any worries.


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Old 04-09-2005, 07:11 PM   #29
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surprizingly, our cars are decent at high speeds, very comftrable ride at higher end speeds. Quite responsive, depends on the tires ur riding on as well. My car handles much better now since I got the T-type rims with a decent set of tires.
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Old 04-09-2005, 07:29 PM   #30
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I had no idea our cars could even do 120mph. How long does it take to get up to that speed? I notice that my car has a real lack of acceleration after about 75mph.
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