Hey y'all, it's been a LONG time.
With gasoline prices being what they are, I wonder if anyone has tinkered with various speeds to see at what speeds would one get the best fuel economy (everything else being equal). I have a 1997 Bonneville with a 3800 Series II from an " '01 or '02 Buick LeSabre" and I assume the transmission is obvious & ubiquitous (that there are a million identical or nearly-identical engine / transmission combo's out there). Mods & such: Synthetic everywhere, by-pass filter by OilGuard, nitrogen tires to max safe pressure, $170 fuel system cleaning about 6 months ago, plugs are Iridiums about 6 months old, K&N fuel filter, steady diet of MBF (MoleKule Brew Fuel?? I just call it MoleKule Mix)
Yes I followed the rules and did a search first, best one I think was "I want better mileage!!"
by ck8788. Ejjefino said "Accellerate gingerly until the trans shifts into its highest gear, even if you have to speed a little (32 in a 25 zone). "
So is this a simple matter of lower RPM's are better? It gets into AOD gear at about 83 KM/h but that's darn near 20 under the limit!
I know it gets better gas mileage at 55 mph / 90 KM/h than at 62 or 63 mph (100 KM/h is 62.5 mph) but I really would rather not do 85 KM/H for 2 hours just to try it out: I'm hoping someone else has!
(Even a computer simulation)
Related, I hope: I have found best gas mileage after several (4-5) consecutive tanks of 92 Octane gasohol, and if you want to point out that makes no sense, save your breath / keystrokes, I already know that. But it works. 94 Octane gasohol with octane boost (NOS with nitromethane in it) and it goes down to about the same as 90 Octane gasohol. FWIW one suggestion was that this got it too high and the engine computers & knock sensor got sort of confused and went back to a safe default setting; anyone 'in the know' able to refute or echo that?
What's the state of those instant fuel-consumption meters? I'm thinking something more than a vacuum guage; I heard about those 20 years ago.
Is there a point to cranking up nominal timing? Having a "summer thermostat"
I want to drive to beaches LOTS in the next 2-3 months and I know going over 100 KM/h really guzzles.
Thankyou very much in advance
Rob, the oil nut