i got my new summit magazine yesterday and as i was flipping thru the pages i stopped and read the Q&A section. i couldnt help but chuckle a bit when a guy said i have a 1970 dodge challenger, the engine went bad so he asked how hard it would be to make it a 400 hp engine that got 28-30 mph! their reply was the 400 hp was easy. but the 28-30 mpg was very unrealistic. (30 mpg out of a 340 isnt hard if your going down a 6% grade.!)

 

My car has 451 hp runs 10.6 and gets 22mpgs. 364cu.in.

MY buddies car runs a 12.1 @ 114 and gets 26 mpgs in a 6 speed camaro. His car dynoed 334 hp I think.

I think mpg's all depend on the tranny setup and how wel lthe fuel management is. Its hard to get performance and mpgs with a carb.

These mpg claims are on the highway cruising at 65mph.

 

the new porsche 918 spyder concept will make 495+ hp and get 78mpg. idk how they did it but its crazy

 

technology is a great thing and never think something is impossible.

We have been to the moon, there has to be a way to get and old v8 up to 30mpgs!!

 

im sure gas powered 1tons will get 30 mpg .
sometimes i wish i could say im from Missouri

i agree with tranny and gears and tire size.. but the 78 mpg is kinda hard to swallow.

 

I wouldn't find the 78mpg hard to believe, but at the same time the car will cost ??? $500,000. It would take a looonnng time to pay of vs an old classic v8 that gets 15mpgs.

 

http://www.rsportscars.com/porsche/p...pyder-concept/

couldn't find a price

 

that say its a hybrid. not gas only also its just a concept.

 

Guys, I have an 09 Challenger R/T,that's 375 HP, 3.92 gears and in 6th gear, 60 mph on the highway, it's turning 1400 rpm. What kinda gas mileage ya think that gets?

 

I wish my truck would turn 1400 RPM at 60 MPH on the highway....

 

im not sure my dakota has 3.55 gears ..in high gear at 60 im running 1600 and get 20mpg if im on a flat strecth no hills...so id say your close to my dakota

 

I had a 3.9L/NV4500/3.54 gears with a set of 255/65/16 tires and would get 24MPG in my dakota. Tranny gearing and tire size plays a huge factor. The truck I have now has 4.10 gears with 245/75/16 tires which equals out to poop for MPG. (235/85/16 and a detroit locker will help out though.)

 

I've been lucky. If it's all highway, I'll get about 28-30. City... wellll.. that's a different story. For some reason it seems it's tough to get more than about 15 mpg with it. Can't understand that at all, I really TRY not to shift above 3000 rpm or squeal the tires more than every other red light, but sometimes I slip up lol

 

I had a '71 'cuda 340 with a 727 auto and 3.91 gears. Mods were headers, Edelbrock Torker intake, and a Holley 600 carb. I got 28 mpg out of it on a cross-country drive. This was highway mileage, of course. For awhile I thought my gas gauge was broken because it wasn't going down as quickly as I thought it would, but it was fine, the car just loved the highway.

Coincidentally enough, my 2006 Pontiac GTO with a 6 speed manual trans got exactly the same highway mileage.

 

727 with 3.91 gears.... a girl i know has a 06 pontiac auto. dont think its a gto it looks like it with a v6 and she says she gets 20 at best. the best i got out of a small block was a 78 diplomat 727 with lock up converter. not sure what the gears were. 18 mpg on highway. every week for to months i did the math not guess....im not saying you were guessing.
i have a freind that said his 06 f 150 got 20. and i asked him how he came up with that figure he said he guessed it lol.. i told him how to calc it out and he only got 15 mpg.

 

I'd have to say your math is off, I would think 15 is more likely what you got.