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Thanks! I have both already. Guaranteed nobody stealing gas, but good thought :)

Thanks! Yeah, that link doesn't specify HW vs city, and anyway, the numbers I replied with aren't in line with that anyway :) ("17-18 is 35% lower, the equivalent of 1700-3500 lb -- way more than 300-400 lb.")

I get 300 miles per tank when highway driving, so perhaps 5 full tanks? ~1500 miles. where is that from? I'm guessing that doesn't apply to steady highway-only driving, but mixed driving. Even if that were the case at highway driving, that's just 5-10% less for the topper weight, and I should...

Thanks for the suggestion. But like i've mentioned 5 times in this thread :D, higher octane makes my mpg go DOWN. I don't understand it.

It does, but only from rolling resistance; and in that case, relative weights between topper and vehicle matters -- as that impacts tire deformation at given pressure -- and I think it's minimal change. What other impacts are there besides rolling resistance, at steady cruise? (not a rhetorical...

...how? I mean it's not much lower than mine, but just curious what mods you have.

Ah, I see. There have been several instances of the battery being disconnected for a while, as part of the service work that was being done. These were disconnected for a few hours to days each time. The shorting wasn't done, but after a few hours caps should be discharged.

Good thought. I had front alignment checked when I replaced tires about 2k miles ago, and they were (or so they say) spot on. The wear looks normal, from what I can see. To your point, perhaps something recently changed in alignment, but I also randomly checked it after the last time offroading.

I have a solar panel charging the battery, so it's in perfect health so far :) I'm not using the onboard mpg indicator -- I'm hand-calculating mileage. I did calibrate the onboard mpg so that it matches to 0.1 mpg, so I could use it if desired. Yeah, agreed, and I do drive and enjoy :) But...

Interesting ideas -- good point on spark plugs as well (nobody's brought that one up yet). That would mean they'd have to have been damaged on arrival, right? If mpg was poor out of the gate.

Right, but...mpg truly didn't change :D I have spreadsheet records to show that it didn't, as I started tracking mpg right away (hand-calculated). Same as it didn't change on my '97 when adding the topper. But yeah, agreed it's significant weight. It just doesn't really seem to impact mpg. And...

Thanks. Yeah, it's way worse :D, and at 80 mph i'll get 15-16 mpg. Purely around town is 15. It's terrible...

Yeah, this is a good one to try :) I've done it for short stretches, but for safety reasons I haven't been able to stay at 55 mph on the highways I drive. For short stretches, it's ~ 23 mpg at 55 mph.

About 300-400 pounds -- so it's significant. Note: as mentioned in the first post, I got 19-20 mpg with no topper and a stock truck, and still 19-20 with the topper on. Then that decreased to 17-18, with no change in total vehicle weight.

Yes, I've already calibrated it when I bought the vehicle. It's within 0.1 mpg of hand-calculated.

No :) Just cooling the back while it's sitting, else it turns into an oven...

Thanks. I do all of these as standard, which is why the poor mileage is frustrating. (I mentioned in various posts -- but the thread is long so of course it's not expected that you'd read them all :)

I see, good to know. I see "axle" and "73", so i'm guessing that means 3.73?

Great question -- I have no idea :) I do have the tow option as you mentioned, but I thought it only changed added tow hardware/software, and didn't affect drive-train: Page 1 of this seems to indicate only one ratio: 3.73 Also, "This towing package adds a heavy-duty Class-IV trailer hitch...

Continuing the reply list: 16) I didn't give context for labeling it a lemon. I've had SO many issues with this vehicle, not just the mileage. It's constantly in the shop, and I'm only at 8k miles. If you search some of my posts you'll see some of the issues; these include a leaking cab...