changes in 2005 vs 2007?

That is a great question as the experts I am sure will chime in. As I do not know of any build differences with the drive train, my thoughts are that there are many variables that would play a part in this but the results should not be that far apart. Could have old/wrong spark plugs, sticky brake caliper or parking brake, fuel/air filter clogged HV battery modules/modules weak, etc. 5 - 10 mpg is a big difference I would think. I would hook up the mini-VCI and take a look at things.
TomK

 

I think the only changes where different front under paneling (it may or may not give better aerodynamics), chrome upper grill peace, front fender badges, different instrument cluster, different MFD, some changes in audio system, different surface on some interior parts, different rear lights, and some differences in options.

There shouldn’t be any measurable difference in fuel economy.

 

The differences between model years are largely cosmetic. You are correct to expect similar mpg, therefore you need to look at what is wrong with the 2007. For example, dragging brakes, poor wheel alignment, tire pressure too low, engine oil viscosity and oil level, engine air filter is clogged, tires are not low rolling resistance design, to start.

 

I wouldn't draw any conclusions for a few months or at least 4 tanks. Make sure you compare calculated mpg off recites not the display. Don't forget to take temperatures into account. It's getting colder for some of us. Good luck.

 

Exactly what I said Patrick. Check all so call tune up things along with brakes and tire set up. As far as temperature he is in the same area as me and I am still getting low to mid 50's for mileage and it has not gone down yet from summer mileage so temperature is not the issue yet.
TomK

 

There is no engine nor other major change in 2007, but 2005 wheels....probably only had the 15-inch wheel option whereas 2007 you can get Touring version with 17-inch wheels.

 

I have a 2005 and a 2007. As others have said, they are virtually identical cars mechanically, with only minor changes that should not affect economy. My 2005 and 2007 are within 2MPG of each other in similar driving situations. If you're seeing a 10MPG difference, then there is an unknown contributing factor.

 

There is no other way to get accurate data. Anecdotal observation of the consumption screen is prone to error and "selective memory.

 

The Touring has 16" wheels and a different suspension. Since Op's tires are the same I don't think he has a 2007 Touring.

The fuel filter is in the tank so that's not going to be replaced. 10mpg is too much for tp. I'd start by checking the brakes. Shouldn't need spark plugs.