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Old 03-21-2013, 05:45 PM   #10 (permalink)
Master EcoModder
Join Date: Oct 2012
Location: Carson City, Nevada
Posts: 612

Jimmy - '00 GMC Jimmy SLT
90 day: 21.18 mpg (US)

The White Gnat - '99 Suzuki Swift
Team Suzuki
90 day: 51.87 mpg (US)
Thanks: 236
Thanked 109 Times in 87 Posts
If your route has areas where you'll be driving at 50 mph or so, grille blocking would probably help. Every time I've tried it, there's been a significant improvement (like 2 mpg). Definitely get a ScanGauge, or something that shows you what kind of results your getting from your different ideas you try.

When I tried to P&G or hold a good BSFC load going up a hill in my Jimmy with auto trans, I couldn't do it - mashing the throttle enough to get the engine load up there would always cause it to downshift & also shoot up right past my best fuel economy speed. So I found that just trying to hold it at best fuel economy speed did the best.

And 50 mph might be too high for your car. I was assuming it would be around 50 mph for my Jimmy - that lower speeds might be "lugging" it. But nope, turns out 40 mph was actually the best speed. (and I checked it a couple times to make sure). Too slow for the freeway (I tried it & got honked at a lot ), so then I found NON-freeway routes where the speed limit was closer to 40. With the ScanGauge, I found that coasting up to stops from half a block away in neutral really boosted the average mpg, too. It was weird getting used to acceleraing off a green light & then throwing it into neutral and coasting before even getting up to the speed limit, but if you see the light 3/4 of a block ahead turn yellow, that's what you do - and it works!!!

But do a grille block - that should help a lot.
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