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Old 02-25-2013, 09:30 AM   #29
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Hello Andy

We can all speculate on how well a vehicle will tow and the resultant fuel economy towing, but until we actually "tow with it" we really don't know. Glad that you will be getting some test data with a normal Taurus and a turbo 2.0L Escape.

You seem to be suggesting that turbo gassers may suffer more loss of fuel economy towing than turbo diesels. If testing bears this out, then that is ok; it is what it is. However, I don't understand why the turbo gassers should suffer a larger percentage loss of fuel economy towing than turbo diesels.

Dan
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Old 02-25-2013, 10:28 AM   #30
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Hello Andy

We can all speculate on how well a vehicle will tow and the resultant fuel economy towing, but until we actually "tow with it" we really don't know. Glad that you will be getting some test data with a normal Taurus and a turbo 2.0L Escape.

You seem to be suggesting that turbo gassers may suffer more loss of fuel economy towing than turbo diesels. If testing bears this out, then that is ok; it is what it is. However, I don't understand why the turbo gassers should suffer a larger percentage loss of fuel economy towing than turbo diesels.

Dan
Normal turbocharged gasoline engines run a VERY different cycle than turbodiesels. Turbodiesels generally don't have a wastegate at all, they are operating under boost whenever they're far enough above idle for the turbo to create positive pressure in the intake. They use the turbo to provide a greater air charge for the same overall displacement of the engine, effectively increasing the compression ratio. In compression-ignition engines, higher compression ratios generally yield higher efficiency.

Gasoline turbocharged engines typically aren't operating under boost in lower-demand operating conditions and transition to positive pressure in the intake only when necessary.

So, when you have a bigger engine set up intentionally for high-load usage (with the transmission and differential ratios selected accordingly) it can do more without requiring boost. That fits with what Andrew T said about box trailers vs. Airstreams with the F150 Ecoboosts... the box trailer's higher aero drag causes the truck to need the turbo more, where the Airstream only needs much boost for climbing hills.
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Old 02-26-2013, 11:47 AM   #31
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DKB

Thanks for the very thorough explanation.

One other question. Would you expect the fuel economy drop to be larger, going from solo to towing, for a turbo V6 F150 than for a non turbo V8 F150?

Thanks, Dan
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Old 02-26-2013, 12:57 PM   #32
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DKB

Thanks for the very thorough explanation.

One other question. Would you expect the fuel economy drop to be larger, going from solo to towing, for a turbo V6 F150 than for a non turbo V8 F150?

Thanks, Dan
I don't have any personal experience but from what I've read.

Short answer yes.

Long answer the turbo V6 F150 gets better non towing mileage and drops down to the same or slightly better towing mileage than for a non turbo V8 F150 (with an Airstream).

In other words the turbo V6 F150 has farther to drop to get to the same point.
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Old 03-10-2013, 09:32 AM   #33
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I have a 2012 F-150 Crew Cab EcoBoost V6 and I pull a 28 ft. Flying Cloud with no problem. I get about 10 mpg while highway touring with trailer and 17 mpg without trailer on highway.
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