```Gotcha!!!!! -----Original Message----- From: Adam Bradley To: Patrick P. Castronovo ; snyler ; Ryan, Richard ; 'datsunmike' ; 'Datsun Roadsters' Date: Friday, February 09, 2001 3:31 PM Subject: Re: Gas Mileage >What cruise control on a Datsun Roadster??? > > >--- "Patrick P. Castronovo" wrote: >> Well you could always engage the Cruise Control to maintain speed. >> >> -----Original Message----- >> From: snyler >> To: Ryan, Richard ; 'datsunmike' >> ; >> 'Datsun Roadsters' >> Date: Friday, February 09, 2001 2:23 PM >> Subject: RE: Gas Mileage >> >> >> >Ryan, Richard wrote >> > >> >>So the real question is: At which rpm (3,200 or 4,000) does the >> engine >> >>produce 30 hp most efficiently. >> >> >> >>And the answer is: Beats the hell outta me. I don't have any >> engine >> >>design info that I can use to get the answer. Some have commented >> that >> >>changing axle ratios and/or tire sizes will change the equation. >> That is >> >>correct because changes the 2 rpm points and the efficiency will be >> >>different at those rpm. >> >Find out empirically. Plot out a flat level run on the interstate >> of, >> >say 35 miles out, and 35 miles back. Use a gas station as your base >> camp. >> >Fill the tank. Make your first run at 70 mph in 4th gear, 35 mi. >> out, 35 >> >mi back. Fill the tank at the same pump and record how much fuel it >> >takes. Make run #2 :35 mi out, 35 mi back, at 70 mph in 5th gear. >> Fill >> >up at the same pump and record how much fuel it takes. The run that >> >takes less fuel is obviously the more efficient. The 4th gear run >> will >> >spin the motor 56,000 more times on our 70 mile, 1 hour trip. Hard >> to >> >imagine that your foot would be lighter on the gas in 4th than 5th >> to >> >maintain 70 mph. I'm guessing you'd do better in 5th, but only >> >experimentation will tell us for sure. >> > >> >-marc >> > >> >>========================================================================== >> >Marc Tyler >> >Designer, >> >Animal Firm >> >830-324-6578 >> >www.animalfirm.com >Get personalized email addresses from Yahoo! Mail - only \$35 >a year! http://personal.mail.yahoo.com/ ```