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Originally Posted by 2009Toyotoad
.....drafting will get the red lights behind you in a hurry out here. Its my understanding that to be effective you need to get close enough to be out of the turbulence wave coming off the "draftee" so it depends on how big the draftee is. It might be possible with an 18 wheeler but not with an SUV or cargo Van......
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Quote:
Originally Posted by Fat Charlie
The first hardware upgrade is either a ScanGauge or UltraGauge. Even before it's properly calibrated, the instant mpg numbers are useful- you can watch the effects of other traffic on you.
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Quote:
Originally Posted by Fat Charlie
......UltraGauge plugs into the OBD connector.......
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the point is, a gauge will let you know where the drafting sweet spot is. it depends on a lot of things: speed, size of vehicle to draft, winds; head vs cross, types of road.
without a proper gauge to go by, it's just a guess of what your vehicle is doing, or wait till the next fill up, then it's a guess what went wrong/right.
i know, within a few points, what my mileage is going to be way before i fill up. beginning of this week i had strong headwinds, few days of rain. really dropped mileage. got lucky and had tailwinds with clear skies the rest of the week and am on target for another 58-60 mpg, all thanks to Ultragauge.