I just drove from Boston to Toronto and got 750km (about 463 miles for you Americanos) on a tank, which is almost 27mpg. The engine was running a little over 3000 at 80mph most of the way. I was completely shocked at the mileage because I don't get nearly that from highway driving in Canada. I think I just realized why, but I'm not sure and maybe others can chime in on this: in Boston I filled up using 93 octane whereas in Canada I use 91 (it's tough to find anything higher here without driving out of your way). Has anyone else seen significant improvement by going to a higher octane gas?

 

http://landiss.com/files/mphvrpmG35.xls

 

The G is a great touring/performance vehicle. With my V1 on, I was averaging 90 miles an hour going to LA to Vegas. I ended up with 26.5 miles per gallon. So just imagine if I drove efficently!

 

i just drove from Vancouver to Banff and got 755kms (470 mi) out of 15.6 gal which equates to 30.1 mpg. this was with a well-loaded down sedan and numerous WOT passing zones. i averaged 70-75 mph, revving around 2600-2700 i believe...

 

At 78mph the rpms were around 2800-2900.

 

What tires and sizes are you guys running who are getting 27+ mpg on long trips? My best was about 26-27 mpg on a road trip to Las Vegas but that was on the oem sport 17's with stock tires at 215/55/17. Now that I'm on 245/45/17 sticky summer tires I can only do about 23 mpg best on mostly highway driving.

 

i get 1000000000000000000 mpg...
























with my car off in the garage.

 

I just got done driving to Vancouver, Wa and back (from Seattle). According to my Navi mpg (which is pretty accurate), I was getting about 25.5 mpg. On a 18 gal tank, that's 460 miles.

BUT I was on my coupe wheels/tires that usually hurts my mileage because:
1) They are heavier than oem. Wider also.
2) The rear tire is taller, thus screwing with the Navi calculations a bit.


I could see 500 miles on oem 215 width tires. VS my coupe 245s.

 

^the coupe 19s are lighter than the OEM 17s.

 

90% of my driving is city driving. I think im probably making 15 mpg. On top of that, my spirited driving doesnt help.

.

 

I doubt that. The WHEELS only MIGHT be close but I know the wheel/tire combo on the coupe 19s aren't lighter than the wheel/tire combo on the sedan 17s w/ 215s.

When I swapped, I remember picking up both to compare.

The 245-40-19 RE050s are heavy as hell. Like 29lbs each! The stock 215-55-17 Turanza EL42s are 26lbs each.

 

I don't doubt it at all. Are the 17's also Forged?

I'm assuming Klubbheads was refering to just the rim itself? The OEM 19's are really light for being 19's, and lighter than many 17's.

.

 

Well unfortunately for us, we can't just ride on the wheels.

17s are not forged. But the 17x7 cast wheel is no more than about 20-22lbs anyway. The 19s are are forged yes. But that's what you have to do to get a 19x8.5 wheel down in weight. ie.. 20-22lbs.

 

duuuuuude ur so funny!DOMO <--- that you btw!

 

Yep and the 19s have worse moment of inertia since more of the wheel/tire weight is further from the hub.