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I recently got a Passport Elite and broke it in with a family trip from Louisiana to Georgia. On the way back to Louisiana, I decided to double check the MPG that the Passport records by also checking it the old-school way. The Passport says around 22-23 MPG and I was pushing it pretty good at around 80 MPH average on open highways and using adaptive cruise control primarily and in Econ mode. Some other relevant information is that the vehicle was rather loaded with 3 people and full of cargo, I have roof rails and cross bars, and I have factory rims/tires (fully inflated with nitrogen). Considering those factors. I wouldn’t have a problem with that kind of fuel mileage. However, when I double check the numbers manually, I am getting about 1-2 MPG lower than the Passport reads. This is with serval fills ups across the US South and the terrain varies somewhat. I get that there is a margin of error considering that I can’t know that I am filling up to the exact same amount (to count accurate difference), but that is a 10+% difference in some cases. That doesn’t seem right to me. I am curious if anyone else has found the same instead of just going on their Passport’s information alone. Is it an inaccurate calibration (perhaps because Touring and Elite have different tire diameters than Sport or EX-L), or is it just a known fact that we get cheated at the pump with less in than the gas pump gauge actually reads?
 

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I'm averaging from 8 tenths to 1 mile when comparing manually on my Touring. I averaged the same with my 2012 Pilot. Strangely my wife has a 2013 CRV and her mileage is always higher when checked manually. When I owned the Pilot I asked the service dealer if they could reprogram it and was told no.
 

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I just filled this morning. Dash indicator said 24.6 mpg and actual calculated was 23.3 mpg. This is typical. Total, in 2,500, is 23.72 mpg. My Ford F-150 has a way of adjusting the factor that computes the mpg in a service menu that is easy to access.
 

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Lower MPG is typical for most fuel gauges on most brands. I knew mileage would be low. Didn’t buy it for that. Traded in a CRV which got much better mileage. However, I had three in a row and was ready for a change. Also own a 2017 Honda Accord Sport and a Fiat Spider 124 roadster convertible. All fun to drive in their own way!
63 and retired.
 

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Same here, using fuelly, I write what the dash reads (for each fill up under the notes) vs the calculated value. It is always off by 1-2 mpgs, not impressed. I am not discouraged by the lower mpg since it is close to the EPA mileage, but by the lack of accuracy on a new vehicle. Hyundai paid the price when their MPG was lower than advertised, but that is not the case here. Still, Honda needs to fix this.
 
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