| strat61caster |
08-01-2015 08:58 PM |
Quote:
Originally Posted by tahdizzle
(Post 2338350)
WTF does octane have to do with MPG? lol
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A fair amount, a modern vehicle tuned for a higher octane will reduce timing and therefore power on a lower octane fuel to prevent knock. If an engine is producing reduced power you will need to push the pedal harder and burn more gas to maintain your typical driving habits (merging on the freeway, cruising at 65).
(coincidentally this ties in with why turbo engines are now so popular, they are pseudo "high displacement" high power very thirsty motors when required such as merging and then when off the throttle they are small displacement gas sippers)
I've read and heard the correlation is that for every dollar you save filling up with low octane you loose about "a dollars worth of range" (i.e. you basically filled it up with ~$1 less of fuel from full of higher octane) so you cost of fuel/mile is the same with the cheaper fuel. I've never bothered to verify for myself so idk.
Quote:
Originally Posted by Tcoat
(Post 2338467)
After 40 years and driving probably 300+ different MT vehicles (military and my own) I can honestly say that without a doubt I have no clue what RPMs I start out at. I am driving a car not landing a jumbo jet on an instrument only approach. I just don't look nor care what the tach says and about 98% of what I drove didn't even have one. Some times I start at lower revs sometimes at higher, it all depends upon what I am doing at that point in time. I will soon be teaching my grandson to drive my car and the very first order of business will be to tape over the tach so he learns how to hear and feel the car instead of driving by a gauge.
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+1 My first manual car had no tach, I spent 20k miles learning in a 134hp 3,200 lb pickup truck. I recently found out that it actually has a fuel cutoff rev limiter at 6,500 rpm, fun car. And I know I was lucky with a 5 speed, good AC and power steering, lap of luxury right here.
:burnrubber:
Also, remember the conversation we had a few weeks back about how the younger generation is afraid to make mistakes? This thread is another good example, they don't want to fuck up their sports car, they want to operate their transmission the best that they can based on a wide set of datapoints and suggestions.
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