Poor gas mileage, questionable coil pack, oil on spark plugs...

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2013 Mazda CX-5 Sport FWD Auto
My dad was into sailing. First a 19' Chrysler, then a Cat22 ... a J24. When he turned 80 they sold their lake place and donated the boat. But he couldn't let it go and some guy sold him a Cat 25 and delivered it to a slip he found at a nearby lake. But we found nobody wanted to try and tow it because it had a fixed keel and rode almost 15ft high. He had to get some guy with a bulldozer to take it from the storage place down to the boat ramp every season.

A good thing he enjoyed painting because that's how he spent most of his time with it.

I'm more apt to put a kayak on my roof than tow a trailer but it still adds drag. I know how it is moving stuff. And sometimes you have to. But from now on I'm going go with a U-Box or similar if at all possible.

Moved in Oct with biggest uhaul I could get. I rented their flatbed trailer and put my CX5 on that. 12 hours on the road getting maybe 5 miles to the gallon doing 50-55 mph lmbo. I wanted to do the Uboxes or PODS but with moving expenses, I sucked it up and saved several thousand dollars. Next move? Nope. I’m splurging on movers and a service.
 
Did the OP every find out why his CX5's MPG dropped after pulling that boat?
Nope, dealer took a look at it 2x and basically said it’s running fine that I could get an engine diagnostic for like $800. But that they wouldn’t likely find anything so it wouldn’t be worth it.

I just drove 600 Mike’s round trip this weekend averaging 23mpg... which I guess isn’t terrible but it’s far off from the 30mpg I used to readily obtain.

I’m going to change the trans fluid this spring, and clean the MAF. We’ll have to see what happens but I have a feeling my car just assumes it needs to make more power now and it’s locked into a memory of towing causing poor MPG. It’s fine cause I tow a lot of motorcycles.

Also, the CX-5 did great towing everything for the 700miles. Suspension wasn’t even sagged and the engine buzzed like a little bee the whole time. I didn’t find it was really straining itself. So I have a feeling it’s all electronic.
 
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2018 AWD GT Premium Red/Black
Nope, dealer took a look at it 2x and basically said it’s running fine that I could get an engine diagnostic for like $800. But that they wouldn’t likely find anything so it wouldn’t be worth it.

I just drove 600 Mike’s round trip this weekend averaging 23mpg... which I guess isn’t terrible but it’s far off from the 30mpg I used to readily obtain.

I’m going to change the trans fluid this spring, and clean the MAF. We’ll have to see what happens but I have a feeling my car just assumes it needs to make more power now and it’s locked into a memory of towing causing poor MPG. It’s fine cause I tow a lot of motorcycles.

Also, the CX-5 did great towing everything for the 700miles. Suspension wasn’t even sagged and the engine buzzed like a little bee the whole time. I didn’t find it was really straining itself. So I have a feeling it’s all electronic.
I wonder if the computer learned your shift behavior while towing and is now tuned to that, holding higher revs before upshifting, and such.
 
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