Power setting and big tires

[Ldub]

Wow. I never drove my Corvette (on the hwy) between 40-60 -- for a LONG stretch. The only speed where I've measured MPG is 70. And, it was in the 30mpg range -- sixth gear.

About the slowest I'd drive in 6th w/o lugging is 60 -- even then steep uphills would require 5th. So, I'm not sure the same approximation applies to the vette. (If so, It must get well over 30mpg in reality.)

So comparing apples & oranges shows me...what?

That vacuum idea is very good. Not sure how cheap/easy -- but good. OTOH, gut instinct had already told me much over 2k rpms would cause a drop in MPG.

...And gut instinct is a good substitute for???
Yeh, I'd go with that too...

Re: vac gauge...

Ummmm...yeah, you would have to be able to splice into a vac line, & find a firewall grommet, & mod a universal a pillar pod...not too difficult...

The other issue (and part of the point of this thread), is whether the power option actually improves MPG (vs normal mode) for larger diameter tires -- especially for city driving.

The tc locks @ lower rpm in "normal", @ hwy speed.

Power mode has never been a friend of mileage for me.

:cheers:...