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Old 04-04-2020, 06:38 PM   #8 (permalink)
Master EcoModder
Join Date: Dec 2010
Location: Arkansas
Posts: 700

Toyota Prius SUV - '10 Toyota Prius II
90 day: 59.63 mpg (US)

V6 Ford Ranger Pickup - '96 Ford Ranger
90 day: 25.97 mpg (US)
Thanks: 200
Thanked 132 Times in 105 Posts
I have found that for large v6 engines of the american style. (3.0-4.X L) anywhere from 1200-2700 RPM are within a couple % of peak BSFC.
I really tested this out on the Ranger when I only had 1,2, and 5th. I would drive anywhere from 1st to 2700 RPM at 90% load, 2nd to 3000 RPM at 90% load, then shift to 5th and hit about 1075 RPM at 30 mph and continue increasing speed at 90% load to 45 mph. (28" tire and 3.73s) Then I would just stay in 5th and cruise around at 45 mph since that is the speed limit here. A little pulse and glide with EOC and what not, DWB up to stop signs. I did note that you get charging issues doing that and wouldn't dare use the starter. I actually had a tank of cruising around town at 25 mpg for about 100 miles on a stock 1996 Ford Ranger 3.0 5 speed with EGR issues, vaccum leaks, and more sensor issues. Been working on getting the transmission back in it now that Quarantine has hit and I have more free time. It has been one hell of a pain in the ass!

*I think skip shift is the way to go on these bigger non 4 cylinder engines. Going gear to gear at 90% load on the bigger stuff is a little too brisk for me versus how slow the old 96 civic was at doing it.
"I feel like the bad decisions come into play when you trade too much of your time for money paying for things you can't really afford."
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